GB876805A - Improvements in making refractory shell molds - Google Patents
Improvements in making refractory shell moldsInfo
- Publication number
- GB876805A GB876805A GB19024/60A GB1902460A GB876805A GB 876805 A GB876805 A GB 876805A GB 19024/60 A GB19024/60 A GB 19024/60A GB 1902460 A GB1902460 A GB 1902460A GB 876805 A GB876805 A GB 876805A
- Authority
- GB
- United Kingdom
- Prior art keywords
- refractory
- composition
- shell
- coating
- match plate
- 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.)
- Expired
Links
- 239000000203 mixture Substances 0.000 abstract 12
- 238000000576 coating method Methods 0.000 abstract 8
- 239000011248 coating agent Substances 0.000 abstract 6
- 239000007788 liquid Substances 0.000 abstract 3
- 239000002245 particle Substances 0.000 abstract 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract 2
- 229910052845 zircon Inorganic materials 0.000 abstract 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 abstract 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract 1
- 239000011398 Portland cement Substances 0.000 abstract 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract 1
- 235000011089 carbon dioxide Nutrition 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 230000008014 freezing Effects 0.000 abstract 1
- 238000007710 freezing Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000013011 mating Effects 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 abstract 1
- 229920002554 vinyl polymer Polymers 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/165—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents in the manufacture of multilayered shell moulds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
A refractory casting mould comprises two or more mating "half-mould" shells (i.e. shells defining only part of a mould) each formed by applying a coating of a hardenable liquid refractory composition to a match plate pattern and embedding in the surface of this coating while it is still liquid a layer of granular refractory particles, hardening the resulting coating on the match plate, similarly applying successive coatings until a refractory shell of substantial thickness has been built up on the match plate, stripping the half-mould shell thus formed from the match plate, and heating the shell to a temperature high enough to fully set the refractory composition. Satisfactory results have been obtained using a refractory composition made by dispersing a finely divided refractory such as zircon or alumina in an aqueous silica sol, which composition may in addition include a resinous polymer, e.g. a vinyl resin, for increased strength in the uncured state. Another satisfactory composition is a dispersion of a finely divided refractory in aqueous phosphoric acid. The composition is preferably applied by flowing it over the surface of the match plate, the excess being drained off and the granular refractory particles, e.g. silica or alumina, applied. A hardening accelerator, e.g. Portland cement when a silica sol refractory composition is used, may be mixed with the dry granular refractory. The mould cavity in the completed shell is defined only by the first applied coating of refractory composition and accordingly this coating may with advantage be formed of a composition in which the refractory is specially selected to yield a fine surface, e.g. finely milled zircon. The subsequent coatings may be formed of a composition in which a somewhat less fine refractory is used, e.g. fireclay grog of nominally 80-mesh particle size. Preferably, the shell is stripped directly it has hardened, sufficient strength being attained by chilling it to below its freezing temperature by the application of crushed dry ice. The shells may either be assembled first and then heated to an elevated temperature to fully set the refractory composition or vice versa, and may be sealed together by applying thereto a coating of an hardenable liquid refractory composition similar to that used to build up each shell on the match plate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US876805XA | 1959-06-11 | 1959-06-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB876805A true GB876805A (en) | 1961-09-06 |
Family
ID=22206625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19024/60A Expired GB876805A (en) | 1959-06-11 | 1960-05-30 | Improvements in making refractory shell molds |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB876805A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3213497A (en) * | 1963-11-19 | 1965-10-26 | Harbison Walker Refractories | Method of treating an investment mold |
| DE1291058B (en) * | 1962-06-20 | 1969-03-20 | Foseco Trading Ag | Additive to molding sand for clay-bound wet molds |
| EP0072329A1 (en) * | 1981-08-07 | 1983-02-16 | Creusot-Loire | Process for making a ceramic shell mould element, and mould element obtained |
| CN105014004A (en) * | 2014-04-30 | 2015-11-04 | 江苏万恒铸业有限公司 | Optimized technology for manufacturing water glass shell |
-
1960
- 1960-05-30 GB GB19024/60A patent/GB876805A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1291058B (en) * | 1962-06-20 | 1969-03-20 | Foseco Trading Ag | Additive to molding sand for clay-bound wet molds |
| US3213497A (en) * | 1963-11-19 | 1965-10-26 | Harbison Walker Refractories | Method of treating an investment mold |
| EP0072329A1 (en) * | 1981-08-07 | 1983-02-16 | Creusot-Loire | Process for making a ceramic shell mould element, and mould element obtained |
| CN105014004A (en) * | 2014-04-30 | 2015-11-04 | 江苏万恒铸业有限公司 | Optimized technology for manufacturing water glass shell |
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