Ceramic materials for use in insert-casting and processes for pr

Details Ceramic materials for use in insert-casting and processes for pr Ceramic materials for use in insert-casting and processes for pr

1989-12-04

1991-11-19

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 80, 501134, 501152, C04B 3510, C04B 3546, C04B 3550

Patent

active

050666266

ABSTRACT:
A ceramic material for use in insert-casting, which contains not less than 65% by volume of aluminum titanate as a crystalline phase. The average particle diameter of crystals of the aluminum titanate is not less than 10 .mu.m, and not more than 20% by volume of a glass phase containing a rare earth element in an amount of 0.5 to 16% by weight when calculated in the form of an oxide is contained. Young's modulus is 50 to 2,000 kgf/mm.sup.2. A process for producing the same is also disclosed, which includes the steps of preparing a powder by mixing a material, as an Al.sub.2 O.sub.3 source material, containing not more than 96% by weight of Al.sub.2 O.sub.3 and having an average particle size of not less than 3 .mu.m, a material having an average particle diameter of not more than 3 .mu.m as a TiO.sub.2 source material, and a given rare earth element in an amount of 1.8% by weight when calculated in the form of an oxide, shaping the powder, and drying and firing the shaped body. The ceramic material has an actual break strain of not less than 6.times.10.sup.-3. The process for producing such a ceramic material includes a step of cooling the shaped body at a rate of at least not less than 500.degree. C./hr in a temperature range not less than 200.degree. C. during and/or after the firing.

REFERENCES:
patent: 4118240 (1978-10-01), Takabatake
patent: 4194917 (1980-03-01), Sakemi et al.
patent: 4327188 (1982-04-01), Endo et al.
patent: 4483944 (1984-11-01), Day et al.
patent: 4746638 (1988-05-01), Hori et al.
patent: 4767731 (1988-08-01), Asami et al.
patent: 4855265 (1989-08-01), Day et al.
Chemical Abstract-"Ceramic Material for Use as a Port Liner to be Insert Cast-Has Aluminum Titanate as Major Crystalline Phase", J63-236,759 (10/3/88) (Japan Patent Pub.).
Chemical Abstract-"Aluminum Titanate Honeycomb Ceramic-for Treating Automobile Exhaust Gases" J56-89844 (7/21/81) (Japan Patent Public.).
Chemical Abstracts-"Aluminum Titanate Honeycomb, Useful as Catalyst Carrier-Comprising Aluminum Titanate, at least 1 of Lantharum, Cerium, and Yttrium Oxide and Opt. Ferric Oxide", Japanese Patent Public. 56-92,164-(7/25/81).
Japanese Patent Abstract-56-89844 "Ceramic Honeycomb and Its Production" 7/21/81 (same as Chem. Abstract 2).

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