經濟部中央標準局貝工消費合作社印裝 A7 ____B7_五、發明説明（1 ) 專利說明害 本發明係關於一種多孔*可被流體通過之模製體，其 係特別設計爲了從狄塞爾內燃機之廢氣中移除柴油積碳顆 粒。其係由以碳化矽爲材料所造成之交替關閉之蜂窩狀體 所組成。本發明另外關於一種製備此模製體之方法，其中 矽之起始粉末或矽與部份碳化矽及/或碳之混合物與有機 黏合劑結合，並經焦化與模製•其特別經過擠壓而成爲粗 坏，然後在惰性氣體中進行焦化烘製；然後將以此方法所 獲得之模製體在存有氮或包含氮之惰性氣體之情況下加熱 至足以造成自由矽與在反應燒製中之碳轉變成爲碳化矽之 溫度。 模製體如同過濾器元素與觸媒之載體物質日漸增加其 重要性，尤其是在牽涉熱氣體之應用•因爲此種類之模製 體是格外對溫度有阻抗的。因此之故*特別有興趣於其從 狄塞爾內燃機之廢氣中移除柴油積碳顆粒之用途•同樣地 這些積碳顆粒相信會產生致癌作用· 曾證明碳化矽材料是特別適合此目的*其是化學安定 的且論證具有髙溫度阻抗與熱安定性。然而•儘管大量嘗 試•仍延伸從此可達到所有必需要求之材料製備模製體之 困難·曾在這些嘗試中應用不同之方法。 在DE-C — 41 30 630所詳加敘述之方法 中，從矽或從矽與碳及/或α -碳化矽中形成起始粉末。 此與可焦化之有機黏合劑及溶劑（較佳爲水）結合。例如 經由擠壓作用而形成粗坏，然後在惰性氣體中或在真空中 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公釐) I I 士 ^ 丁 4^ U3-'s0- - y (請先閲讀背面之注意事項再填寫本頁) — ^ — 經濟部中央標準局一貝工消費合作社印裳 A7 B7 五、發明説明（2 ) 藉由加熱至6 0 0 °C與1 0 0 0 °C間之溫度而碳化《然後 將以此方法所獲得之模製體在1 4 0 0與2 0 0 0 °C間之 溫度下進行反應燒製β因此矽與碳轉變成爲—碳化矽。 至於這些具有狄塞爾內燃機之模製體之應用，在定期 間隔之時間而清除沈積在模製體上之積碳顆粒是重要的· 此方法，流動阻抗不會變的太大·爲了達成此目的’經ΐ 電流藉由充份地加熱模製體而燒掉積碳顆粒•然而’碳化 矽具有相當高之阻抗。因此，爲了加熱模製體至充份高溫 ，需要高電壓•因此之故，藉由添加不同物質至碳化矽中 ，特別是氮而處理碳化矽之導電度•在上述之方法中*不 是藉由添加適合之化合物至該粉末中就是在氮氣或含氮氣 體中藉由進行反應燒製而達成》 在其實際應用中*上述方法有其限制，僅當與小於1 mm之格外窄之壁厚相結合時，可經由此方法所達成之細孔 結構能夠使流速滿足。且此類窄之壁厚甚至在粗坏之製造 中亦呈現困難•甚至較嚴重爲此種類之模製體未擁有充份 強度之事實。且若在狄塞爾內燃機中使用時，此型式之模 製體將曝露相當之振動。 爲了達成可被流體通過之性質（需要達到具有充份強 度之必需要求），曾在上述方法中使用第二種變化而進行 嘗試。在此變化中，首先形成粒狀·然後經由準物壓燒結 模製而成爲粗坏。不理會在程序中需要額外步驟之事實， 此導致在公分範圍內之壁厚•雖然壁厚可經由車削加工過 擎 程而降低*但爲了安定性之原因，其至多僅可降低一半· 本紙張尺度適用中國國家標準（CNS ) Λ4規格（2IOX 297公釐) ' -5 - ----------枯衣------訂--------1. (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印袈 A7 _____B7_五、發明説明（3 ) 儘管如此，每過濾器表面積之陶器建築材料之體積是相當 大的，尤其是簡單擠踱管幾何形狀僅可使用此方法。此外 當經由具有氮而降低比阻抗時，對於再活化作用所需要之 能量是高的•此外，模製體之輔助車削加工使得製造成本 更貴。 另一嘗試係以在ΕΡ-Α—0 336 883中所 詳細描述之方法進行•在該專利中推薦在碳化矽模製體之 範圍內，在7 5至1 7 0 粒徑範圍中之原始碳化矽粉 末做爲起始材料使用•該粉末與黏合劑結合，經模製而成 爲粗坏，然後爲了消除或舒緩黏合劑，加熱至1 5 0 0 °C 與1 9 0 0 °C間之溫度。此方法經由外相一起鍵結碳化矽 顆粒。 用此方法，如用前述之方法，無法製備令人滿意之模 製體，就外相來說，熱與化學阻抗是負面影響的。無法產 生髙程度安定性或髙程度導電性•在燒結中，通常發生 1 5 %或更多之線性收縮*結果製備正確尺寸且不具有阻 力之幾何結構是困難的•此外，利用相當粗糙S i C顆粒 所達成之被流體通過之性質是無法令人滿意的，除非在此 例中，如前所述使用非常窄之壁厚，否則其無法完成安定 性之要求。在另一方面，矽顆粒之大小不可任意地增加， 因此同樣會導致安定性之問題•另外之缺點爲碳化矽粉末 係格外具有磨損力時•此導致在製備模製體時（在其擠壓 作用•與在任何可能之加工步驟）髙程度之磨損· 在W0 93/13303中所詳加敘述之方法中， 本紙張尺度適用中國國家標準（CNS > A4規格（210X29*7公釐)~~~ (請先閱讀背面之注意事項再填寫本頁) A7 B7 經濟部中央標準局員工消費合作社印製 五、發明説明（4 ) 使用以近乎7 0重量％特大號材料（尺寸範圍在3 5與 1 2 5 jwm之間）與近乎4至1 3重量％較一般爲小之材 料（尺寸範圍在0 . 3與2 jam之間）之二種統計方式顆 粒大小分佈之碳化矽顆粒做爲起始材料。在添加黏合劑之 後，模製粗坏並在3 0 (KC與5 Ο 0T間加熱（爲了燃燒 掉黏合劑）·然後，將以此方法所形成之模製體加熱至大 於2 2 0 0 °C至2 6 0 (KC之溫度（爲了分解較一般爲小 之材料）·在蒸發-冷凝作用機構中，在粗糙顆粒之接觸 點上分解產物沈澱出來（如同昇華物），因此在這些顆粒 之間產生安定之橋。 此方法提供不會發生收縮之利益。因此，可製備具有 良好的被流體通過之性質與良好強度之模製體。然而，此 方法之缺點爲觸發蒸發一冷凝作用過程需要在2 5 0 0°C 之範圍中之格外髙溫•此需要相當髙之能源消耗。此外， 在體製備中，模製體之擠壓作用，與任何可能之車削加工 步驟中起始材料產生髙程度磨損。在每一例中所需要之較 一般爲小之材料是相當昂貴的。且有兩種統計方式之顆粒 分佈導致在製備過程中|相分離^之危機· 本發明之目的係製備一種經特別設計用以移除積碳顆 粒之模製體*該模製體擁有依據過濾器效率，被流體通過 之設計，安定性，與電阻之適當性質•該目的另外伴隨形 成可再生此型式之模製體之方法，且在粗坏之製備中允許 低程度之磨損· 此目的之第一部份係由在終端交替關閉之蜂窩狀體所 ---------篆— (請先閲讀背面之注意事項再填寫本頁) 訂 本紙张尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印装 A7 _ B7五、發明説明（5 ) 組成之模製體達成，且該模製體之特徵爲下述： 壁厚 ：1.25±0.5皿1: 多孔性 ：55至60%; 平均孔徑 ：25至70//m: 比滲透性 ：20至lOOnPm。 在上述中，交替關閉之蜂窩狀體參考描述於 E P 〇 3 3 6 883中之圖5與6，且其特徵爲所 設計之蜂窩狀通道在流進與流出側交替關閉。此方法，欲 清除之氣體必須通過側面之通道壁•在本發明中所詳加敘 述之模製體在狄塞爾內燃機粗加工狀態具有充份之強度， 同時擁有低程度壓力損耗之被流體通過之性質。 在本發明之發展中，以粗模製體之比電阻r應規定 在特殊範圍中•較佳在相當於下式之1：»111與1· 之間爲 條件： ----------批衣------iT, (请先閲讀背面之注意事項再填寫本頁)Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives A7 ____B7_ V. Description of the invention (1) Patent description The invention relates to a porous * fluid-permeable molded body, which is specially designed to be used from Diesel internal combustion engines The diesel carbon particles are removed from the exhaust gas. It consists of alternating closed honeycomb bodies made of silicon carbide. The present invention also relates to a method for preparing the molded body, in which a starting powder of silicon or a mixture of silicon and a part of silicon carbide and / or carbon is combined with an organic binder and coked and molded. It is particularly extruded It becomes coarse, and then is coked and baked in an inert gas; then the molded body obtained by this method is heated in the presence of nitrogen or an inert gas containing nitrogen enough to cause free silicon and firing in the reaction The temperature at which carbon is transformed into silicon carbide. Molded bodies are becoming increasingly important as carrier materials for filter elements and catalysts, especially in applications involving hot gases. Because this type of molded body is particularly resistant to temperature. That's why * I'm particularly interested in its use to remove diesel carbon deposits from the exhaust of Diesel internal combustion engines. Similarly, these carbon deposits are believed to have a carcinogenic effect. Silicon carbide materials have proven to be particularly suitable for this purpose * It is chemically stable and has demonstrated temperature resistance and thermal stability. However, despite extensive trials, the difficulty of making molded bodies from materials that have met all the necessary requirements has been extended. Different methods have been applied in these attempts. In the method detailed in DE-C — 41 30 630, a starting powder is formed from silicon or from silicon and carbon and / or α-silicon carbide. This is combined with a cokerable organic binder and a solvent, preferably water. For example, coarseness is formed by extrusion, and then the paper size is applied to the Chinese National Standard (CNS) A4 (210 × 297 mm) in an inert gas or in a vacuum. II ^ ^ 4 ^ U3-'s0--y ( Please read the notes on the back before filling in this page) — ^ — Yin Chang A7 B7, a Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (2) By heating to 6 0 ° C and 1 0 0 0 Carbonization at a temperature between ° C and then the molded body obtained in this way is reacted at a temperature between 14 0 and 2000 ° C to fire β. Therefore, silicon and carbon are converted into silicon carbide. As for the application of these molded bodies with Diesel internal combustion engines, it is important to remove the carbon deposits deposited on the molded bodies at regular intervals. This method does not make the flow resistance too large. To achieve this Purpose 'Warp current burns out carbon deposits by sufficiently heating the molded body. However,' SiC 'has a fairly high impedance. Therefore, in order to heat the molded body to a sufficiently high temperature, a high voltage is required. • For this reason, the conductivity of silicon carbide is treated by adding different substances to the silicon carbide, especially nitrogen. • In the above method * not by The addition of a suitable compound to the powder is achieved by reaction firing in nitrogen or a nitrogen-containing gas. In its practical application * the above method has its limitations, only when combined with a particularly narrow wall thickness of less than 1 mm At this time, the pore structure achieved by this method can satisfy the flow velocity. And this kind of narrow wall thickness presents difficulties even in rough manufacturing. Even more serious is the fact that this type of molded body does not have sufficient strength. And if used in Diesel internal combustion engines, this type of molded body will be exposed to considerable vibration. In order to achieve the property of being able to be passed by a fluid (necessary to have sufficient strength), attempts have been made to use the second variation in the above method. In this variation, grains are first formed and then roughened by quasi-physical pressure sintering molding. Ignoring the fact that extra steps are required in the procedure, this leads to wall thicknesses in the centimeter range. • Although the wall thickness can be reduced by turning through the engine, * it can only be reduced by half for stability reasons. The scale is applicable to the Chinese National Standard (CNS) Λ4 specification (2IOX 297 mm) '-5----------- Ku Yi -------- Order -------- 1. ( Please read the notes on the back before filling in this page) Seal A7 of the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs _____B7_ V. Invention Description (3) Nevertheless, the volume of ceramic building materials per filter surface area is quite large, In particular, this method can only be used for simple extruded tube geometries. In addition, when the specific resistance is reduced by having nitrogen, the energy required for reactivation is high. In addition, the auxiliary turning of the molded body makes the manufacturing cost more expensive. Another attempt was performed using the method described in detail in EP-A-0 336 883. • In this patent, it is recommended that the original carbonization be in the range of silicon carbide molded bodies, in the range of 75 to 170 particle sizes. Silicon powder is used as the starting material. This powder is combined with the adhesive, and it becomes coarse after molding. Then, in order to eliminate or soothe the adhesive, it is heated to a temperature between 15 0 ° C and 19 0 ° C. . This method bonds the silicon carbide particles together via the external phase. In this way, if the aforementioned method cannot be used to produce a satisfactory molded body, the thermal and chemical resistance are negatively affected in terms of the external phase. Can not produce a degree of stability or a degree of conductivity • In sintering, linear shrinkage of 15% or more usually occurs * As a result, it is difficult to produce a geometric structure of the correct size without resistance • In addition, the use of rather rough S i The properties of C particles that are passed by fluids are unsatisfactory. Unless in this case, very narrow wall thicknesses are used as described above, they cannot fulfill the requirements of stability. On the other hand, the size of the silicon particles cannot be arbitrarily increased, so it also causes stability problems. Another disadvantage is that the silicon carbide powder system has extra abrasive power. This results in the production of a molded body (when it is pressed). Function and degree of wear in any possible processing steps. In the method detailed in WO 93/13303, this paper size applies the Chinese national standard (CNS > A4 size (210X29 * 7mm) ~ ~~ (Please read the notes on the back before filling in this page) A7 B7 Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (4) Use of approximately 70% by weight extra-large materials (size range is 3 5 And 1 2 5 jwm) and approximately 4 to 13% by weight of smaller materials (size range between 0.3 and 2 jam), two statistical methods of particle size distribution of silicon carbide particles as the starting point After adding the adhesive, the mold is roughened and heated between 30 (KC and 5 0 0T (to burn off the adhesive). Then, the molded body formed by this method is heated to more than 2 2 0 0 ° C to 2 6 0 (KC In order to decompose materials that are generally smaller) · In the evaporation-condensation mechanism, the decomposition products precipitate at the contact points of rough particles (like sublimates), so a stable bridge is created between these particles. This method provides no The benefit of shrinkage will occur. Therefore, a molded body with good properties of fluid passage and good strength can be prepared. However, the disadvantage of this method is that the evaporation-condensation process needs to be in the range of 2500 ° C. Extraordinary temperature • This requires considerable energy consumption. In addition, in the preparation of the body, the extrusion of the molded body and the starting material in any possible turning process step cause a high degree of wear. Required in each case Relatively small materials are quite expensive. And there are two statistical methods of particle distribution leading to the crisis of phase separation in the preparation process. The object of the present invention is to prepare a carbon particle specifically designed to remove carbon deposits. Molded body * The molded body has the proper properties of design, stability, and resistance to pass through according to the efficiency of the filter. • This purpose is accompanied by formation A method of regenerating this type of molded body and allowing a low degree of wear during rough preparation. The first part of this purpose is by a honeycomb body that is closed alternately at the terminal .---------篆 — (Please read the notes on the back before filling in this page) The size of the paper is applicable to China National Standard (CNS) A4 (210X297 mm) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 _ B7 V. Description of the invention (5) The composition of the molded body is achieved, and the characteristics of the molded body are as follows: Wall thickness: 1.25 ± 0.5 dish 1: Porosity: 55 to 60%; Average pore size: 25 to 70 // m: Specific permeability Properties: 20 to 100 nPm. In the above, the alternately closed honeycomb bodies are described with reference to FIGS. 5 and 6 in EP 0 3 3 883, and are characterized in that the designed honeycomb channels are closed alternately on the inflow and outflow sides. In this method, the gas to be removed must pass through the side channel wall. The molded body described in detail in the present invention has sufficient strength in the rough machining state of Diesel internal combustion engine, and at the same time has low pressure loss and is passed by the fluid. The nature. In the development of the present invention, the specific resistance r of the rough molded body should be specified in a special range. Preferably, it is equivalent to the following formula: 1: 111 and 1 · as a condition: ------- --- Batch clothing ------ iT, (Please read the precautions on the back before filling this page)
Psrt 1 其中 P 代表所需要之電加熱能力， I 代表最大可忍受之電流強度， Um«x代表最大可忍受之電壓* 本紙張尺度適用中國國家標準（CNS ) A4現格（2I0X297公釐） 經濟‘部中央標準局員工消費合作社印製 A7 __B7五、發明説明（6 ) a q 代表模製體之載m流之截面積，而 1 代表模製體之載電流之縱面積|且其中p t 爲小於或等於u x i mex。此外，所瞭解之可忍受電壓 與電流強度值不可或不能超過目前使用者特殊之要求。模 製體之比電阻r較佳在0.1與3 ohmxcm之間。 至於設定之電阻，週期表之第三與第五主族或B族元 素之化合物及/或元素本身是相當適合的。其可添加至模 製體中。可使用之元素爲硼，包含於模製體中硼之含量爲 0 . 05重量％至1 . 0重量％，此量參照元素硼本身， 甚至當硼係以化合物之形式存在時，例如碳化硼，條件是 方便的。 爲了能夠製備如上所詳加敘述之模製體，推薦根據本 發明之方法，其係以如DE — C — 41 3 0 630之 上述方法爲基礎。然而，在本發明所詳加敘述之方法中， 在高於2 0 0 0 eC，較佳在2 1 0 0 °C與2 3 0 0 °C之間 進行再結晶作用燒製。再結晶燒製導致一定之細孔成長， 結果本質上改善被流體通過之性質。此意指特殊（與材料 有關係）之被流體通過之性if與根據D E — C -41 30 630 (未具有粒狀形成）所製備之模製體 比較本質上是較大的，因此更令人喜歡。在與根據 W 0 9 3/1 3 30 3所製備之模製體比較，所製備之 該模製體必須具有非常窄之壁厚，所以其仍擁有被流體通 過之性質且仍可使用於狄塞爾積碳過濾*本發明詳加敘述 之方法，可製備具有相當大壁厚之高安定性模製體，其擁 本紙張尺度適用中國國家標準（CNS > A4規格（210X297公釐） ---------^------1T (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印装 A7 B7 五、發明説明（7 ) 有相同之被流體通過之阻抗，適合粗加工應用狀態。以積 碳沈澱層之被流體通過阻抗之觀點而言此亦令人喜歡的。 此外，再結晶作用燒製增加模製體之擦傷阻抗並提供另一 達成物質之較佳同質性之優點。以電阻之觀點而言此是特 別令人喜歡的。 在單一煙道中，藉由將模製體連續地帶至再結晶燒製 之溫度中而進行反應與再結晶燒製•然而，同樣在再結晶 燒製之後，接著（較佳立即）進行反應燒製*此方法提供 更多彈性，特別是關於避免收縮之過程。通常在1 7 0 0 1與1 9 0 0 °C之間進行反應燒製。 在本發明所詳加敘述之方法中較佳可有利地應用在起 始粉未中沒有原始碳化矽。然後大部份記下經由再結晶燒 製可達成細孔成長之效果。因此，改善被流體通過之性質 ，然而若在本方法中所製備之模製體之強度與擦傷阻抗不 足時|在最均質之分佈中可方便地添加原始碳化矽至起始 粉末中。然而，爲了保存擠壓作用集合體之鋼模（對於蜂 » 窩狀體之製備其與調製，擠壓與可能之車削加工集合體一 樣是格外昂貴的），建議在起始粉末中原始碳化砂之比例 限制於最大2 5%。此亦在起始粉末中隨著原始碳化矽含 量之增加而降低細孔成長之效果之事實所證實。而且，隨 著原始碳化矽之添加將影響導電度。 醣類化合物，或其衍生物係特別適合做爲黏合劑。曾 證實澱粉，特別是改良之澱粉是特別合適的。高碳產出率 提供下述之優點：經由焦化所形成之碳橋在熱過程中提供 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） ---------批衣—— (請先閲讀背面之注意事項再填寫本頁) 訂 A7 __B7_五、發明説明（8 ) 良好之黏結力；因此，在焦化期間其保持最小之收縮。此 促進終了模製體之被流體通過之性質。 在起始粉末之混合期間，黏合劑可以粉末形式添加》 然而，亦可使用在室溫爲液體之黏合劑。黏合劑較佳應爲 可溶於水的。所使用之黏合劑量可方便地調整使得所有碳 對在起始粉末中之自由矽呈現化學計量之關係。 至於已在先前提到之理由，用以增加導電度之添加劑 以使得比電阻在r min與r max之間（根據上述公式，尤其 是在0·01至3.0 ohmxcm之範圍中）之數量 添加至起始粉末中。此外，添加劑應由週期表之第三與第 五主族或B族之化合物且/或元素所組成。尤其硼是非常 適合此目的且所添加之量爲在起始粉末中硼元素以 0 . 05至1 . 0重量％之數量存在。若添加劑以粉末形 式添加時，顆粒大小不可超過1 0 Mm。 ?· 最後，本發明以下述爲條件：所使用之自由矽且/或 碳之平均顆粒大小應在1 0至7 0 之範圍中。 (請先閱讀背面之注意事1填寫本頁) 本紙張尺度通用t國國家標準（CNS ) Λ4规格（2丨〇〆297公釐） 11 經 濟 部 中 央 標 準 局 % 工 消 費 合 作 社 印 製 Λ7 B7 五、發明説明（） 應燒製之後立刻接著再結晶燒製* 1 1 .如申請專利範圍第6項之方法，其特徵爲在 1 4 0 0 °C與1 9 0 0°C之間進行反應燒製。 1 2 .如申請專利範圍第1 1項之方法，其特徵爲在 1 7 0 0 °C與1 9 0 0 °C之間進行反應燒製。 1 3 .如申請專利範圍第6項之方法，其特徵爲在起 始粉末中所包含之原始碳化矽比例係小於或等於2 5重量 %。 1 4 .如申請專利範圍第6項之方法，其特徵爲使用 醣族化合物或這些化合物之改良物之化合物做爲黏合劑。 1 5 .如申請專利範圍第1 4項之方法，其特徵爲使 用經改良之澱粉做爲黏合劑· 1 6 .如申請專利範圍第6項之方法，其特徵爲黏合 i 劑亦以粉末形式添加至起始粉末中* 1 7 .如申請專利範圍第6項之方法，其特徵爲使用 在室溫爲液體之黏合劑· 1 8 .如申請專利範圍第6項之方法，其特徵爲使用 水溶性之黏合劑。 1 9 .如申請專利範圍第6項之方法，其特徵爲調整 所使用之黏合劑比例以使所有碳（包括包含於黏合劑中之 碳）對在起始粉末中之自由矽之化學計量比例爲在〇 . 8 至1 . 2之間· 2 0 .如申請專利範圍第6項之方法，其特徵爲添加 用以燴加淇雷伸夕菰加劑.所添加之董明確_導致雷阳介 本紙張尺度適用¥_國_國家標準（CNS ) Λ4規格（210X297公釐) ^ ^ ---------裝------訂，--------泉 (請先閲讀背面之注意事項再填寫本頁) 3Psrt 1 where P is the required electrical heating capacity, I is the maximum tolerable current intensity, Um «x is the maximum tolerable voltage * This paper size applies Chinese National Standard (CNS) A4 (2I0X297 mm) Economy 'Ministry of Central Standards Bureau printed A7 __B7 V. Description of the invention (6) aq represents the cross-sectional area of the current carrying m of the molded body, and 1 represents the vertical area of the current carrying the molded body | and where pt is less than Or equal to uxi mex. In addition, the tolerable voltage and current strength values cannot or cannot exceed the special requirements of current users. The specific resistance r of the molded body is preferably between 0.1 and 3 ohmxcm. As for the set resistance, compounds and / or elements of the third and fifth main group or group B elements of the periodic table are quite suitable. It can be added to the molded body. The element that can be used is boron, and the content of boron contained in the molded body is 0.05% to 1.0% by weight. This amount refers to the element boron itself, even when the boron system exists as a compound, such as boron carbide. Conditions are convenient. In order to be able to produce a molded body as described in detail above, the method according to the invention is recommended, which is based on the above-mentioned method such as DE-C-41 3 0 630. However, in the method detailed in the present invention, recrystallization firing is performed at a temperature higher than 2000 eC, preferably between 2100 ° C and 2300 ° C. Recrystallization firing results in certain pore growth, with the result that the property of being passed by the fluid is substantially improved. This means that the special (relative to the material) nature of the fluid passing through is larger than the molded body prepared according to DE — C -41 30 630 (without granular formation), so it makes the People like it. In comparison with the molded body prepared according to W 0 9 3/1 3 30 3, the prepared molded body must have a very narrow wall thickness, so it still possesses the property of being passed through by fluids and can still be used in Di Sell Carbon Filtration * The method described in detail in the present invention can prepare a highly stable molded body with a considerable wall thickness. The paper size is applicable to Chinese national standards (CNS > A4 size (210X297 mm)- -------- ^ ------ 1T (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description (7) Same The resistance of the fluid passing through is suitable for rough machining applications. This is also desirable from the viewpoint of the resistance of the fluid passing through the carbon deposits. In addition, the recrystallization firing increases the abrasion resistance of the molded body and provides Another advantage of achieving better homogeneity of the substance. This is particularly preferred from the point of view of resistance. In a single flue, the reaction is carried out by continuously bringing the molded body to the temperature at which the recrystallization is fired And recrystallization firing • However, the same After firing, followed by (preferably immediately) reaction firing * This method provides more flexibility, especially with regard to the process of avoiding shrinkage. Reactive firing is usually carried out between 17 0 1 and 19 0 ° C In the method described in detail in the present invention, it can be advantageously applied to the absence of the original silicon carbide in the starting powder. Then, most of the notes are that the effect of pore growth can be achieved by recrystallization firing. Therefore, improvement The property of being passed by fluid, however, if the strength and abrasion resistance of the molded body prepared in this method are insufficient | It is convenient to add the original silicon carbide to the starting powder in the most homogeneous distribution. However, for preservation For steel molds of compacted aggregates (for the preparation of bees »nests, their preparation and extrusion are as expensive as possible turning aggregates), it is recommended that the proportion of the original carbonized sand in the starting powder be limited to the maximum 2 5%. This is also confirmed by the fact that the pore growth is reduced with the increase of the original silicon carbide content in the starting powder. Moreover, the addition of the original silicon carbide will affect the conductivity. Saccharification Materials, or their derivatives, are particularly suitable as binders. Starches, especially modified starches, have proven to be particularly suitable. High carbon yields provide the following advantages: the carbon bridges formed by coking are thermally processed The paper size provided is applicable to China National Standard (CNS) A4 specifications (210X297 mm) --------- Approval of clothing-(Please read the precautions on the back before filling this page) Order A7 __B7_ Description of the invention (8) Good cohesive force; therefore, it maintains minimal shrinkage during coking. This promotes the property of fluid passing through the final molded body. During mixing of the starting powder, the binder can be added in powder form "However, It is also possible to use adhesives that are liquid at room temperature. The adhesive should preferably be water-soluble. The amount of binder used can be easily adjusted so that all carbons have a stoichiometric relationship to the free silicon in the starting powder. As for the reasons already mentioned previously, the amount of the additive to increase the electrical conductivity so that the specific resistance is between r min and r max (according to the above formula, especially in the range of 0.01 to 3.0 ohmxcm) is added to In the starting powder. In addition, the additives shall be composed of compounds and / or elements of the third and fifth main or group B of the periodic table. In particular, boron is very suitable for this purpose and is added in an amount such that the boron element is present in an amount of 0.05 to 1.0% by weight in the starting powder. If the additives are added in powder form, the particle size must not exceed 10 Mm. • Finally, the invention is conditional on the following: the average particle size of the free silicon and / or carbon used should be in the range of 10 to 70. (Please read the note on the back 1 to fill in this page) The paper standard is the national standard (CNS) Λ4 specification (2 丨 〇〆297 mm) 11 The Central Standards Bureau of the Ministry of Economic Affairs% Printed by the Industrial and Consumer Cooperative Λ7 B7 5 2. Description of the invention () It should be fired immediately followed by recrystallization and fired. * 1 1. The method according to item 6 of the patent application is characterized in that the reaction is carried out between 14 0 ° C and 19 0 ° C. Fired. 12. The method according to item 11 of the scope of patent application, characterized in that the reaction firing is performed between 1700 ° C and 1900 ° C. 13. The method according to item 6 of the scope of patent application, characterized in that the proportion of the original silicon carbide contained in the starting powder is less than or equal to 25% by weight. 14. The method according to item 6 of the scope of patent application, characterized in that a sugar compound or a compound of an improvement of these compounds is used as a binder. 15. The method according to item 14 of the scope of patent application is characterized by using modified starch as a binder · 16. The method according to item 6 of the scope of patent application is characterized in that the agent i is also in powder form Added to the starting powder * 1 7. The method as claimed in item 6 of the patent application is characterized by the use of a binder which is liquid at room temperature. 1 8. The method as claimed in item 6 of the patent application is characterized by the use of Water-soluble adhesive. 19. The method according to item 6 of the scope of patent application, characterized in that the proportion of the binder used is adjusted so that the stoichiometric ratio of all carbon (including the carbon contained in the binder) to the free silicon in the starting powder The method is between 0.8 and 1.2. The method according to item 6 of the scope of patent application is characterized by adding a chewing agent for adding Qi Lei Xing Xi Xi. The added director is clear _ leading to Lei Yang The paper size is applicable to ¥ _Country_National Standard (CNS) Λ4 specification (210X297 mm) ^ ^ ------------------------- (Please read the notes on the back before filling this page) 3