Compositions: ceramic – Ceramic compositions – Refractory
Patent
1992-05-29
1994-03-22
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
C04B 3548
Patent
active
052964205
ABSTRACT:
A relatively dense composite refractory material which has reasonable strength and good thermal shock resistance comprises an alumina matrix material within which are dispersed particles of polycrystalline zirconia comprises from 1.0 to 40 percent by volume of the composite material. Each particle of zirconia is an agglomerate of microcrystals which are strongly bonded together. Due to the agglomerates of the bonding together of the microcrystals at their grain boundaries. The microcrystals contain no matrix material within their agglomerates, and exhibit strong thermal expansion anisotropy. They have a size such that cracks do not form spontaneously within the agglomerates during cooling from about 1600.degree. C. to room temperature. Typically the agglomerates have a mean diameter of from 10 to 15 micrometers, while the average diameter of the microcrystals in an agglomerate is from 1 to 2 micrometers.
REFERENCES:
patent: 3992213 (1976-11-01), Desouches et al.
patent: 4298385 (1981-11-01), Claussen et al.
patent: 4322249 (1982-03-01), Claussen et al.
patent: 4421861 (1983-12-01), Claussen et al.
patent: 4571331 (1986-02-01), Endou et al.
patent: 4666467 (1987-03-01), Matsumoto et al.
patent: 4804644 (1989-02-01), Anseau et al.
patent: 4873064 (1989-10-01), Kato
patent: 4929574 (1990-05-01), Iltis et al.
Bell Mark L.
Commonwealth Scientific & Industrial Research Organization
Wright A.
LandOfFree
Composite refractory materials does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Composite refractory materials, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Composite refractory materials will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-436680