Ceramicm port liners

Details Ceramicm port liners Ceramicm port liners

1991-03-08

1993-11-09

Loney, Donald J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428 76, 428137, 428148, 428155, 428156, 428161, 428163, 428167, 428173, 428210, 428469, 428702, 428699, 428913, 123270, 123 65PE, 123668, 123669, 29888061, B32B 300, F02B 7502

Patent

active

052601161

ABSTRACT:
Ceramic materials to be insert-cast are disclosed, which each contain not less than 65% by volume of aluminum titanate as a crystalline phase, and have an average particle diameter of crystals thereof being not less than 10 .mu.m, Young's modulus of 50 to 2,000 kgf/mm.sup.2, compression strength of 5 to 40 kgf/mm.sup.2, and porosity of 5 to 35%. Ceramic port liners are also disclosed, which are free from cracking due to compression force during insert-casting, peeling-off during use, and facilitate insert-casting. To attain this, a reinforcement which meets either one or both of requirements that differences in coefficient of thermal expansion at 800.degree. C. and Young's modulus between the reinforcement and a material constituting the port liner body are in a range of .+-.0.1% and in a range of .+-.1,000 kgf/mm.sup.2, respectively, is filled into a depressed portion at an outer peripheral surface of the port liner body to form an integrated structure with a flat or swelled surface. Alternatively, the outer peripheral surface of the port liner body is worked to give uneven portions at a joining surface of the port liner body to a metal to insert-cast the port liner. Another alternative is to utilize a stress-releasing slit formed in a wall of the port liner body. Further, the outer peripheral surface of the ceramic port liner body may be covered with a ceramic sheet which is irreversively expandable by heating.

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Sprechsaal, vol. 118, No. 12 by Dr. Ch. Hahn, Selb, D.

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