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1. 发明专利

JPH02258206A METHOD FOR JOINING CERAMIC FORMED BODY 失效
公开(公告)号：JPH02258206A
公开(公告)日：1990-10-19
申请号：JP8087489
申请日：1989-03-30
申请人： KUBOTA LTD
发明人： YAMAGAMI YOSHIAKI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： B28B11/02
摘要： PURPOSE:To assemble a plurality of ceramic formed bodies in various shapes and to keep a high joint strength by a method wherein butting surfaces are wetted under highly humid atmosphere and, after that, pressed against each other and finally dried. CONSTITUTION:Surfaces 11 and 21, which make them possible to be abutted against each other, are trued at the positions, which make the joint of ceramic formed bodies dried after being formed by casting in and demolded from a water absorptive mold. Next, the butting surfaces are absorbed with water and become wet by being brought into contact with highly humid atmosphere. Wetting treatment is to give viscous states, which make mutual joining by fusion, to the butting surfaces of the respective formed bodies and to be prefer ably wetted so that the water content turns to be about 15wt.% or more. Immedi ately after the above-mentioned wetting treatment is applied to the respective formed bodies, the butting surfaces are abutted against each other and the drying of the resultant body is performed under the state being applied with proper pressing force.

2. 发明专利

JPH0297460A CERAMIC TUBE 失效
公开(公告)号：JPH0297460A
公开(公告)日：1990-04-10
申请号：JP24830688
申请日：1988-09-30
申请人： KUBOTA LTD
发明人： YAMAGAMI YOSHIAKI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： C04B35/46
摘要： PURPOSE:To reduce the coefft. of thermal expansion of a ceramic tube and to improve the cracking and spalling resistances by providing a composite structure contg. aluminum titanate phases and mullite phases as principal phases. CONSTITUTION:Alumina powder is mixed with titania powder in 1:1 molar ratio and calcined at 1,550-1,650 deg.C and the resulting aluminum titanate is pulverized to obtain aluminum titanate powder having

3. 发明专利

JPS6433877A CERAMIC RESISTANCE HEATING ELEMENT AND MANUFACTURE THEREOF 失效
公开(公告)号：JPS6433877A
公开(公告)日：1989-02-03
申请号：JP18831187
申请日：1987-07-28
申请人： KUBOTA LTD
发明人： HAYASHI HIROSHI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： C04B35/457 , C04B35/00 , H01C7/00 , H01C17/00 , H05B3/14
摘要： PURPOSE:To obtain a heating element with high strength and little decomposition and deterioration due to the volatilization of Sb and form the firm connection by specifying the composition of SnO2, Sb2O5, and SiO2. CONSTITUTION:SiO2 5-30wt.% is added to a mixture made of SnO2 75-98wt.% and Sb2O5 2-25wt.%. The mixture made of SnO2 75-98wt.% and Sb2O5 2-25wt.% is temporarily fired at 1100-1300 deg.C, this material is crushed, then SiO2 5-30wt.% is combined with it and fired at 1100-1300 deg.C. A resistance heating element thus obtained has high strength and the firm connection to a substrate and no material change due to the volatilization of Sb while in use and is excellent in stability. When a heater is constituted of this heating element, the stability and durability of the heater function can be improved.

4. 发明专利

JPH02141469A CERAMICS TUBE AND PRODUCTION THEREOF 失效
公开(公告)号：JPH02141469A
公开(公告)日：1990-05-30
申请号：JP29512488
申请日：1988-11-22
申请人： KUBOTA LTD
发明人： YAMAGAMI YOSHIAKI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： C04B35/46
摘要： PURPOSE:To improve the crack resistance and spalling resistance of the ceramics tube as a radiant tube of a steel products heating furnace, etc., by forming the tube of a sintered body of a mixed phase structure in which aluminum titanate phase and an anorthite phase co-exist uniformly and finely at a specific ratio. CONSTITUTION:This ceramics tube consists of the sintered body having the mixed phase structure in which the aluminum titanate phase and the anorthite phase co-exist uniformly and finely at 100:5 to 15 ratio by weight. The tube is produced in the following way, at powder mixture composed of TiO2 and Al2O3 at 1:1 molar ratio is calcined at 1550 to 1650 deg.C and the product of the calcination is pulverized to obtain the powder (A) of the aluminum titanate. On the other hand, a powder mixture composed of limestone and kaolin at 26:74 to 29:71 ratio by weight is calcined at 1220 to 1270 deg.C and the product of calcination is pulverized to obtain the arnothite powder (B). Water is then added to the mixture composed of 100 pts.wt. powder A and 5 to 15 pts. powder B to prepare a slurry. This slurry is cast into a water absorptive mold for centrifugal molding and is made into a cylindrical molding; thereafter, the molding is dried and is calcined at 1400 to 1650 deg.C.

5. 发明专利

JPH029747A PRODUCTION OF CERAMICS TUBE 失效
公开(公告)号：JPH029747A
公开(公告)日：1990-01-12
申请号：JP15835788
申请日：1988-06-27
申请人： KUBOTA LTD
发明人： YAMAGAMI YOSHIAKI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： C04B35/46 , B28B21/08 , B28B21/30
摘要： PURPOSE:To obtain the ceramics tube having the crack resistance and spalling resistance necessary as a pipe material for a high temp. pipe material by drying a cylindrical molding formed by centrifugal cast molding of a specific slurry essentially consisting of titania, alumina and kaolin as raw materials. CONSTITUTION:The slurry is prepd. by adding 5-15 pts.wt. kaolin powder, 5-10 pts.wt. alumina powder, water and necessary slurry preparing agent to 100 pts.wt. powder obtd. by calcining a powder mixture composed of 1/1 molar ratio of titania and alumina at 1550-1650 deg.C to form the aluminum titanate and crushing the calcined matter thereof. This slurry is then cast into a water absorptive mold and is deposited under the effect of the centrifugal force of 5-30G gravity magnification to obtain the cylindrical molding. This molding is dried and is then subjected to a sintering treatment at 1400-1650 deg.C.

6. 发明专利

JPH02258205A METHOD FOR JOINING CERAMIC FORMED BODY 失效
公开(公告)号：JPH02258205A
公开(公告)日：1990-10-19
申请号：JP8087389
申请日：1989-03-30
申请人： KUBOTA LTD
发明人： YAMAGAMI YOSHIAKI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： B28B11/02
摘要： PURPOSE:To assemble a plurality of ceramic formed bodies in various shapes and to keep a high joint strength by a method wherein butting surfaces are pressed against each other under the condition that the butting surfaces are respectively coated with the same slurry as raw material slurry and, after that, pressed against each other and finally dried. CONSTITUTION:Surfaces 11 and 21, which make them possible to be abutted against each other, are trued at the positions, which make the joint of ceramic formed bodies keeping wet state after being formed by casting in and developed from a water absorptive mold. The butting surfaces 11 and 21 are coated with slurry. The slurry used is the same slurry as the slurry, out of which the cast molding of ceramic trued body is performed. After being coated respectively with the slurry, the butting surfaces are abutted against each other and the drying of the resultant formed body is performed under the state being applied with proper pressing force.

7. 发明专利

JPH029746A PRODUCTION OF CERAMICS TUBE 失效
公开(公告)号：JPH029746A
公开(公告)日：1990-01-12
申请号：JP15835888
申请日：1988-06-27
申请人： KUBOTA LTD
发明人： YAMAGAMI YOSHIAKI , HIRAISHI HISASHI , NISHIMURA YUKIO
IPC分类号： C04B35/18 , B28B21/08 , B28B21/30
摘要： PURPOSE:To obtain the ceramics tube having the crack resistance and spelling resistance necessary as a pipe material for a high temp. pipe material such as radiant tube for a steel materials heating furnace to be subjected to rapid cooling drying a cylindrical molding formed by centrifugal cast molding of a specific slurry essentially consisting of mullite, then sintering the molding. CONSTITUTION:The slurry is prepd. by adding 2-6 pts.wt. magnesium carbonate powder, 2-6 pts.wt. calcium carbonate powder, 4-8 parts wt. kaolin, water and necessary slurry preparing agent to 100 pts.wt. powder obtd. by calcining a powder mixture composed of 2/3 molar ratio of quartz and alumina at 1550-1650 deg.C to form the mullite and crushing the calcined matter thereof. This slurry is then cast into a water absorptive mold and is deposited under the effect of the centrifugal force of 5-30G to obtain the cylindrical molding. This molding is dried and is then subjected to a sintering treatment at 1400-1650 deg.C.

8. 发明专利

JPH01179748A SLURRY CASTING METHOD FOR CERAMIC PRODUCT 失效
公开(公告)号：JPH01179748A
公开(公告)日：1989-07-17
申请号：JP282688
申请日：1988-01-08
申请人： KUBOTA LTD
发明人： NISHIMURA YUKIO , HIRAISHI HISASHI , SUGAI ATSUSHI
IPC分类号： C04B35/622 , B28B1/28
摘要： PURPOSE:To improve the denseness, homogeneity, dimensional precision, and strength of a cast product by pouring a specified slurry into a water-absorptive mold, and rotating the mold to adhere the slurry on the inner surface of the mold by centrifugal force. CONSTITUTION:The ceramic particles contg. a bivalent metal salt such as CaCO3 having 0.3-2mum particle diameter are suspended in water, and 0.1-0.5wt.% of one or more kinds of deflocculants selected from water glass, Na2CO3, NaH2PO4, and Na2SO4 are added to obtain a suspension. Aq. ammonium is added, as required, by 0.01-0.3wt.% to the suspension so that the total water content is adjusted to 15-33wt.% to obtain a ceramic slurry (a). The (a) component is poured into the water-absorptive mold 1 (gypsum mold) through a hopper 4, and the mold 1 and a shell 2 are rotated by a rotary roll 5 with the centrifugal force at 30-300G to form a ceramic cast product A(b) on the inner surface of the mold 1. The (b) ceramic product is extracted from the mold 1, dried, and sintered.

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