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WO1999036372A1 - Ceramic material - Google Patents

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Publication number
WO1999036372A1
WO1999036372A1 PCT/IB1999/000022 IB9900022W WO9936372A1 WO 1999036372 A1 WO1999036372 A1 WO 1999036372A1 IB 9900022 W IB9900022 W IB 9900022W WO 9936372 A1 WO9936372 A1 WO 9936372A1
Authority
WO
WIPO (PCT)
Prior art keywords
ceramic material
chromite
mullite
lanthanum
micron
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB1999/000022
Other languages
French (fr)
Inventor
Rustam Rakhimov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU16797/99A priority Critical patent/AU1679799A/en
Publication of WO1999036372A1 publication Critical patent/WO1999036372A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/185—Mullite 3Al2O3-2SiO2
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds

Definitions

  • This invention relates to novel ceramic materials with improved thermal, chemical and physical properties. Such materials can find application in a number of devices where high heating rates and stability of properties are essential.
  • the ceramic material according to the invention can be used to generate infrared (IR) radiation with specific wavelengths.
  • the ceramic material according to the invention can also be used in high-efficiency heaters and emitters which can be used in medicine for treating various disorders, in food industry for processing and cooking foodstuffs, and in light and textile industries.
  • a ceramic material is known according to US Patent #5,472,720, which is the most technically similar to that being proposed; it contains the following ingredients, wt%:
  • This composition is used in a number of devices where high heating rates and stability of properties are essential; it is capable of generating continuous IR radiation at a wavelength of 3-7 micron ( ⁇ ).
  • One shortcoming of the ceramic material is that it cannot generate stable IR radiation with maximum radiation in ranges of 6-8 micron ( ⁇ ) and 25 micron ( ⁇ ).
  • the object of the present invention is to create a ceramic material that has a stable emitting capacity with radiation maximums in wavelength ranges of 6-8 micron ( ⁇ ) and 25 micron ( ⁇ ).
  • the goal is achieved by supplementing a ceramic material containing magnesium chromate (MgCrO 4 ), yttrium chromite (YCrO 3 ), zirconium dioxide (ZrO ), cerium dioxide (CeO 2 ), and lanthanum chromite (LaCrO 3 ), by lanthanum aluminate (LaAlO 3 ) and mullite in the following proportions of ingredients, wt%:
  • Mullite makes up the bulk of the compound, 80.0-99.9% and, accordingly, the composition of the ceramic material can be represented as 80.0-99.9 of mullite and the rest, OJ-20.0%, consists of, wt%
  • the ceramic material being proposed is prepared according to conventional technique.
  • a charge is prepared of the desired composition, ground in a planetary mill in Plexiglas drums and Teflon balls as milling bodies until a fine powder is obtained.
  • the powder is then dried and melted in a solar furnace; the melting is done in an oxidative atmosphere, preferably in air. The melt drips into a cooling tank containing water.
  • the proposed ceramic material obtained.
  • the obtained body is ground, pressed into articles of desired shape, and sintered at 1,600°C for 10 hours.
  • the following method can be used: the obtained body is ground, mixed with a binder based on polyvinyl alcohol or soluble glass, and painted onto the surface of heating elements to be used as sources of primary IR radiation, or onto the surface of other articles to be used as sources of secondary IR radiation.
  • the invention is illustrated with the examples given below of preparing the proposed ceramic material.
  • a charge was prepared of the following composition:
  • mullite 80%, and the rest consisted of:
  • the ingredients were ground in a planetary mill Teflon balls and drums lined with plastic until a fine powder was obtained.
  • the powder was dried and melted in a solar furnace at 2,500°C in air. The melt was dripped into a cooling tank containing water. Thus was the ceramic material obtained.
  • the ceramic material prepared in this way was again milled as described above and screened through a sieve with meshes of 40 micron ( ⁇ ).
  • To the ground composition was added a binder based on polyvinyl alcohol, and the resultant mixture was applied to the surface of an incandescent lamp of 100 watt (W) with a brush and dried.
  • Example (Ex.) 2-6 the specimens of the ceramic material were obtained in the same way as in Example 1, except that the percentages of the ingredients were altered. For ease of explanation the compositions of all the examples are listed in Table 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention 'Ceramic material' relates to ceramic materials capable of generating infrared radiation with specified wavelengths. The object of the invention is to obtain a ceramic material with a stable emitting capacity with radiation maximums within 6-8 micron (ν) and 25 micron (ν). To achieve the goal, the ceramic material contains the following ingredients, wt%: mullite acounts for 80.0-99.9, the rest 0.1-20.0 % being made up of: Mullite 80.0-99.9; Lanthanum aluminate (LaAlO3) 0.0005-2.0; Magnesium chromate (MgCrO4) 0.001-3.0; Yttrium chromite (YCrO3) 0.0005-0.6; Zirconium dioxide (ZrO2) 0.0005-1.0; Cerium dioxide (CeO2) 0.0001-0.2; Lanthanum chromite (LaCrO3) 0.0974-13.2.

Description

CERAMIC MATERIAL
This invention relates to novel ceramic materials with improved thermal, chemical and physical properties. Such materials can find application in a number of devices where high heating rates and stability of properties are essential. For instance, the ceramic material according to the invention can be used to generate infrared (IR) radiation with specific wavelengths.
The ceramic material according to the invention can also be used in high-efficiency heaters and emitters which can be used in medicine for treating various disorders, in food industry for processing and cooking foodstuffs, and in light and textile industries. A ceramic material is known according to US Patent #5,472,720, which is the most technically similar to that being proposed; it contains the following ingredients, wt%:
Magnesium aluminate (MgAl2O4) 0.5 - 10.0
Magnesium chromate (MgCrO4) 1.0 - 15.0
Calcium zirconate (CaZrO3) up to 10.0 Yttrium chromite (YCrO3) up to 5.0
Zirconium dioxide (ZrO2) up to 5.0
Cerium dioxide (CeO2) up to 1.0
Lanthanum chromite (LaCrO3) the rest
This composition is used in a number of devices where high heating rates and stability of properties are essential; it is capable of generating continuous IR radiation at a wavelength of 3-7 micron (μ).
One shortcoming of the ceramic material is that it cannot generate stable IR radiation with maximum radiation in ranges of 6-8 micron (μ) and 25 micron (μ).
The object of the present invention is to create a ceramic material that has a stable emitting capacity with radiation maximums in wavelength ranges of 6-8 micron (μ) and 25 micron (μ). The goal is achieved by supplementing a ceramic material containing magnesium chromate (MgCrO4), yttrium chromite (YCrO3), zirconium dioxide (ZrO ), cerium dioxide (CeO2), and lanthanum chromite (LaCrO3), by lanthanum aluminate (LaAlO3) and mullite in the following proportions of ingredients, wt%:
Mullite 80.0 - 99.9
Lanthanum aluminate (LaAlO3) 0.0005-2.0
Magnesium chromate (MgCrO4) 0.001 - 3.0
Yttrium chromite (YCrO3) 0.0005-0.6
Zirconium dioxide (ZrO2) 0.0005-1.0
Cerium dioxide (CeO2) 0.0001-0.2
Lanthanum chromite (LaCrO3) 0.0974-13.2
Mullite makes up the bulk of the compound, 80.0-99.9% and, accordingly, the composition of the ceramic material can be represented as 80.0-99.9 of mullite and the rest, OJ-20.0%, consists of, wt%
Lanthanum aluminate (LaAlO3) 0.5-10.0
Magnesium chromate (MgCrO4) 1.0 - 1.5
Yttrium chromite (YCrO3) 0.5 -3.0
Zirconium dioxide (ZrO2) 0.5- 5.0
Cerium dioxide (CeO2) OJ- l.O
Lanthanum chromite (LaCrO3) the rest
Research conducted has revealed that it is exactly this proportion of ingredients, where the bulk of the ceramic material is mullite, supplemented by lanthanum aluminate (LaAlO3), that produces a ceramic material with desired properties.
The ceramic material being proposed is prepared according to conventional technique. A charge is prepared of the desired composition, ground in a planetary mill in Plexiglas drums and Teflon balls as milling bodies until a fine powder is obtained. The powder is then dried and melted in a solar furnace; the melting is done in an oxidative atmosphere, preferably in air. The melt drips into a cooling tank containing water. Thus is the proposed ceramic material obtained.
To make articles or specimens of the ceramic material, the obtained body is ground, pressed into articles of desired shape, and sintered at 1,600°C for 10 hours. Alternatively, for application of the ceramic material as an emitter of secondary IR radiation the following method can be used: the obtained body is ground, mixed with a binder based on polyvinyl alcohol or soluble glass, and painted onto the surface of heating elements to be used as sources of primary IR radiation, or onto the surface of other articles to be used as sources of secondary IR radiation. In more detail the invention is illustrated with the examples given below of preparing the proposed ceramic material.
Example 1.
A charge was prepared of the following composition:
mullite was 80%, and the rest consisted of:
Lanthanum aluminate (LaAlO3) 0.5-10.0
Magnesium chromate (MgCrO4) 1.0- 1.5
Yttrium chromite (YCrO3) 0.5 - 3.0
Zirconium dioxide (ZrO2) 0.5 - 5.0
Cerium dioxide (CeO2) 0J - 1.0
Lanthanum chromite (LaCrO3) the rest
Then the ingredients were ground in a planetary mill Teflon balls and drums lined with plastic until a fine powder was obtained. The powder was dried and melted in a solar furnace at 2,500°C in air. The melt was dripped into a cooling tank containing water. Thus was the ceramic material obtained. For testing, the ceramic material prepared in this way was again milled as described above and screened through a sieve with meshes of 40 micron (μ). To the ground composition was added a binder based on polyvinyl alcohol, and the resultant mixture was applied to the surface of an incandescent lamp of 100 watt (W) with a brush and dried. This was followed by testing: voltage was applied to the incandescent lamps and the wavelength of the IR radiation was measured with an IR spectrophotometer. In Examples (Ex.) 2-6 the specimens of the ceramic material were obtained in the same way as in Example 1, except that the percentages of the ingredients were altered. For ease of explanation the compositions of all the examples are listed in Table 1.
Table 1
Figure imgf000006_0001
It should be pointed out that only within the given ranges of percentages was it possible to produce a ceramic material with desired properties.
The data listed in Table 1 clearly illustrate the properties of the new ceramic material. Going beyond the percentage range of the proposed ingredients of the new ceramic material in either direction results in a complete loss of the effect.
Although only six examples are given of percentages of the new ceramic material, so as not to clutter the description with a multitude of tables, the proposed invention covers all combinations of the ingredients within the given percentage range.

Claims

CLAIM
A ceramic material containing magnesium chromate (MgCrO ), yttrium chromite (YCrO3), zirconium dioxide (ZrO2), cerium dioxide (CeO2), and lanthanum chromite (LaCrO3), whose distinguishing feature is that it also contains lanthanum aluminate (LaAlO3) and mullite, in the following proportion of ingredients, wt%:
Mullite 80.0 - 99.9
Lanthanum aluminate (LaAlO3) 0.0005 - 2.0 Magnesium chromate (MgCrO4) 0.001 - 3.0
Yttrium chromite (YCrO3) 0.0005 - 0.6
Zirconium dioxide (ZrO2) 0.0005 - 1.0
Cerium dioxide (CeO2) 0.0001 - 0.2
Lanthanum chromite (LaCrO3) 0.0974 - 13.2.
PCT/IB1999/000022 1998-01-20 1999-01-11 Ceramic material Ceased WO1999036372A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU16797/99A AU1679799A (en) 1998-01-20 1999-01-11 Ceramic material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
UZ9800039 1998-01-20
UZIHDP9800039.1 1998-01-20

Publications (1)

Publication Number Publication Date
WO1999036372A1 true WO1999036372A1 (en) 1999-07-22

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PCT/IB1999/000022 Ceased WO1999036372A1 (en) 1998-01-20 1999-01-11 Ceramic material

Country Status (2)

Country Link
AU (1) AU1679799A (en)
WO (1) WO1999036372A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040100253A (en) * 2003-05-22 2004-12-02 주식회사화동인터내셔날 The multipurpose ceramics balls constituent of a micro ionizing radiation
EP1690842A1 (en) * 2005-02-11 2006-08-16 IBT InfraBioTech GmbH Ceramic compostion and light source for processing plastic materials
CN110483046A (en) * 2019-09-26 2019-11-22 中钢集团洛阳耐火材料研究院有限公司 A kind of high emissivity infrared energy-conserving material and preparation method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114867A (en) * 1980-02-18 1981-09-09 Kogyo Gijutsuin Ceramics for infrared radiation medium
US5707911A (en) * 1992-06-17 1998-01-13 Mitech Scientific Corp. Infrared radiation generating ceramic compositions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114867A (en) * 1980-02-18 1981-09-09 Kogyo Gijutsuin Ceramics for infrared radiation medium
US5707911A (en) * 1992-06-17 1998-01-13 Mitech Scientific Corp. Infrared radiation generating ceramic compositions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 8143, Derwent World Patents Index; AN 81-78462d, XP002096411 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040100253A (en) * 2003-05-22 2004-12-02 주식회사화동인터내셔날 The multipurpose ceramics balls constituent of a micro ionizing radiation
EP1690842A1 (en) * 2005-02-11 2006-08-16 IBT InfraBioTech GmbH Ceramic compostion and light source for processing plastic materials
CN110483046A (en) * 2019-09-26 2019-11-22 中钢集团洛阳耐火材料研究院有限公司 A kind of high emissivity infrared energy-conserving material and preparation method
CN110483046B (en) * 2019-09-26 2021-06-29 中钢集团洛阳耐火材料研究院有限公司 High-emissivity infrared energy-saving material and preparation method thereof

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Publication number Publication date
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