Showing papers on "Ceramic matrix composite published in 1979"
Patent•
13 Sep 1979
Abstract: A thermal stress-resistant rotary regenerator type ceramic heat exchanger comprising a plurality of ceramic honeycomb structural matrix segments bonded by a ceramic binder is produced by extruding a plurality of ceramic honeycomb structural matrix segments, firing the segments, bonding the segments with one another by application of a ceramic binder, said ceramic binder after the subsequent sintering having substantially the same mineral composition as said ceramic matrix segments and the thickness of 0.1 to 6 mm, and a difference in thermal expansion being not greater than 0.1% at 800° C. relative to the ceramic matrix segments, drying the bonded segments, and firing the dried bonded segments.
43 citations
Patent•
21 Sep 1979
TL;DR: In this paper, the authors have shown that the porosity of the above-mentioned ceramic powder material can also be achieved by the step of heating the raw material to 1,400° C to 1.900° C. in the presence of a separately prepared nonsintered molding of ceramic material or sintered molds of the material having a porosity at least 10%.
Abstract: Ceramic powder material mainly consists of silicon nitride wherein the content of oxygen combined with generally unavoidable impurities as measured by activation analysis accounts for less than 2% by weight. The above-mentioned ceramic powder material can also be prepared preferably by the method which comprises the step of heating raw ceramic powder material mainly consisting of silicon nitride to 1,400° C. to 1,900° C. in the presence of a separately prepared nonsintered molding of ceramic material or sintered molding of ceramic material having a porosity of at least 10%.
18 citations
Patent•
01 Mar 1979
TL;DR: In this paper, a tool (a) made of hard metal, is coated with at least one wear-resistant and protective layer (b) consisting of a ceramic matrix (b1) in which another material (b2) is embedded; this layer contains microcracks; and materials (b 1, b 2) have markedly different coefft. of thermal expansion (CTE).
Abstract: A moulding, esp. a tool (a) made of hard metal, is coated with at least one wear-resistant and protective layer (b). At least one layer (b) consists of a ceramic matrix (b1) in which another material (b2) is embedded; this layer (b) contains microcracks; and materials (b1, b2) have markedly different coefft. of thermal expansion (CTE). The CTE of material (b2) is pref. smaller than the CTE of matrix (b1), which is esp. Al2O3 contg. 8-25 vol.% of stabilised and/or partly stabilised and/or partly stabilised ZrO2(b2). Layer (b) is pref. made by either:- (1) chemical vapour deposition (CVD) with continuous and/or alternative deposition of Al2O3 (b1) and ZrO2 (b2), where ZrO2 forms the microcracks; or (2) physical vapour deposition. After coating, the tool (a,b) is pref. heated to complete the phase transformation of the ZrO2.
13 citations
01 Nov 1979
TL;DR: In this paper, thermal diffusivity measurements have been made using the heat pulse method on three 3D carbon fiber carbon composites, three 1-D carbon fibre carbon composite composites from fibres 'F' and 'A' and matrix graphite.
Abstract: : Thermal diffusivity measurements have been made using the heat pulse method on three 3-D carbon fibre carbon composites, three 1-D carbon fibre carbon composites from fibres 'F' and 'A' and matrix graphite. Thermal conductivity has been calculated from these results and a model outlined which predicts the thermal conductivity of a 3-D composite from the processed conductivities of the constituents. (Author)
1 citations