Showing papers on "Ceramic matrix composite published in 1980"
TL;DR: In this paper, the influence of carbon fiber type and carbon fiber surface treatment on the mechanical properties of carbon/carbon composites has been investigated and it was found that only the reinforcement of carbon and carbon composites with untreated type I fibres results in best mechanical properties Surprisingly in that case also an optimised surface treatment of the fibres improved the yield of fibre strength.
78 citations
Patent•
14 May 1980
TL;DR: In this paper, a high strength, fracture tough, high temperature oxidatively stable, heat insulating internal combustion engine combustion chamber component is described made of a silicon carbide fiber reinforced ceramic matrix.
Abstract: A high strength, fracture tough, high temperature oxidatively stable, heat insulating internal combustion engine combustion chamber component is described made of a silicon carbide fiber reinforced ceramic matrix or a silicon carbide fiber reinforced glass matrix material. An internal combustion engine containing combustion chamber components as above described is also disclosed.
73 citations
Patent•
13 Feb 1980
TL;DR: A silicon carbide fiber reinforced ceramic matrix composite is disclosed in this article, having high strength, fracture toughness, and oxidative stability even at high temperature use, and is made up of a plurality of ceramic layers, each layer reinforced with a manifold of unidirectional continuous length silicon carbides, with each layer having an axial flexural strength greater than 70,000 psi and high fracture toughness.
Abstract: A silicon carbide fiber reinforced ceramic matrix composite is disclosed having high strength, fracture toughness, and oxidative stability even at high temperature use. The composite is made up of a plurality of ceramic layers, each layer reinforced with a plurality of unidirectional continuous length silicon carbide fibers, each layer having an axial flexural strength greater than 70,000 psi and a high fracture toughness, exemplified by a critical stress intensity factor greater than 10×103 psi (inch)1/2. The composite is formed by starting with the ceramic matrix material in the glassy state and converting it from the glassy state to the ceramic state after densification of the composite.
70 citations
Patent•
14 Jul 1980
TL;DR: A sintered ceramic body of high toughness, consisting of an isotropic ceramic matrix (e.g. Al 2 O 3 ) and at least one therein-dispersed phase (ZrO 2, HzO 2 ) formed from a powder consisting of particles having an average diameter from 0.3 to 1.25 μm, wherein the ceramic embedment material is present in different enantiotropic solid modifications at the firing temperature of the ceramic body, whose densities are substantially different, is shot through with extremely fine microfractures in high density RE
Abstract: A sintered ceramic body of high toughness, consisting of an isotropic ceramic matrix (e.g. Al 2 O 3 ) and at least one therein-dispersed phase (ZrO 2 , HzO 2 ) of ceramic embedment material formed from a powder consisting of particles having an average diameter from 0.3 to 1.25 μm, wherein the ceramic embedment material is present in different enantiotropic solid modifications at the firing temperature of the ceramic body and below the firing temperature, whose densities are substantially different, and the ceramic body is shot through with extremely fine microfractures in high density.
50 citations
Patent•
19 May 1980
TL;DR: In this article, a ceramic body is formed of a powdered ceramic material which is a precursor to the matrix material of the ceramic matrix, mixed with a compound which can form ZrO 2, HfO 2 or mixture thereof upon reaction with the ceramic material, and thereafter densely sintered below the reaction temperature.
Abstract: A ceramic formed body having high temperature change resistance and stren and being composed of a ceramic matrix with dispersed particles of ZrO 2 , HfO 2 , or mixture thereof, is formed of a powdered ceramic material which is a precursor to the matrix material of the ceramic matrix, mixed with a compound which can form ZrO 2 , HfO 2 or mixture thereof upon reaction with the ceramic material, and thereafter densely sintered below the reaction temperature. The sintered body is then heat treated above the reaction temperature to convert the precursor ceramic material into the matrix material and form the ceramic body with in situ formation of the dispersed particles.
19 citations
Patent•
11 Sep 1980
TL;DR: In this article, a white alumina ceramic plate is interposed between an electronic refrigerating plate 1 and a supporting body 2 to ensure supporting body cooling effect, by interposing between the supporting body and a refrigerator alumina material consisting mainly of alumina, beryllium oxide, silicon carbide ceramic or silicon nitride ceramic.
Abstract: PURPOSE:To ensure supporting body cooling effect, by interposing between the supporting body and a refrigerator alumina ceramic consisting mainly of alumina, beryllium oxide, silicon carbide ceramic or silicon nitride ceramic, etc. CONSTITUTION:A white alumina ceramic plate 3 is interposed between an electronic refrigerating plate 1 and a supporting body 2. As the white alumina ceramic 3 becomes a cold-insulating plate and it excels not only in thermal conductivity but also in electrical insulation performance, it is possible to refrigerate the supporting body 2 satisfactorily. The aforementioned alumina ceramic plate's alumina content is 99%, apparent density 3.8 and water-absorbing rate 0. Beryllium oxide may be used in place of the alumina ceramic plate. While silicon carbide ceramic has shortcoming in the electrical insulation performance, it may be used by being provided with insulation coating treatment.
9 citations
Patent•
28 May 1980
TL;DR: In this article, a method for the production of high-level waste containing moulded materials by which the wastes and the glass, glass ceramic or ceramic matrix surrounding them are sintered by means of pressure and temperature, with the wastes a) in the form of a dry or nearly dry powder being mechanically mixed in a conventional way with the glass or glass ceramic matrix present as a granulate or powder ; or b) in a sludge being concentrated with glass or ceramic powder, mechanically mixed and dried, and the mixture, without previous encapsulation, being directly either c)
Abstract: 1. Method for the production of high-level waste containing moulded materials by which the wastes and the glass, glass ceramic or ceramic matrix surrounding them are sintered by means of pressure and temperature, with 1) the wastes a) in the form of a dry or nearly dry powder being mechanically mixed in a conventional way with the glass, glass ceramic or ceramic matrix present as a granulate or powder ; or b) in the form of a sludge being concentrated with glass, glass ceramic or ceramic powder, mechanically mixed and dried, and 2) the mixture, without previous encapsulation, being directly either c) cold pressed initially at a pressure of 50 MPa to 500 MPa and subsequently sintered below the matrix melting zone in the devitrification range at a temperature between 500 K and 800 K ; or d) pressure sintered at a pressure of 10 to 50 MPa and a temperature in the range of 500 K to 800 K (hot isostatic pressing excepted).
6 citations
01 Jan 1980
TL;DR: The nature of the dependence of the thermal shock resistance of ceramics on the various thermo-mechanical properties of these materials can be used to design, in a systematic way, a new type of composite material with improved thermal shock resistances as mentioned in this paper.
Abstract: The nature of the dependence of the thermal shock resistance of ceramics on the various thermo-mechanical properties of these materials can be used to design, in a systematic way, ceramics with improved thermal shock resistance Great versatility in designing for thermal shock resistance and other desired properties can be achieved via ceramic composite approaches where properties of the two (or more) phases can be used to tailor the properties of the composite
2 citations
TL;DR: In this paper, a comparative experimental investigation of materials with fillers of various types has established that the least frictional losses are exhibited by a composite with a fiber filler, while the highest load-carrying capacity characterizes a material with a powder filler.
Abstract: A vitreous ceramic matrix with a metallic filler in the form of fibers is a composite possessing good frictional qualities. The optimum metal fiber filler content of the composite has been found to be about 50 vol. %. A comparative experimental investigation of materials with fillers of various types has established that the least frictional losses are exhibited by a composite with a fiber filler, while the highest load-carrying capacity characterizes a material with a powder filler.
2 citations
Patent•
13 Mar 1980
TL;DR: In this paper, a vehicle exhaust device or part is protected against corrosion at least internally by coating with an adhering protective layer which contains 5-50% metallic Al-, Ni-, Fe-, and/or stainless steel powder embedded in a glass or ceramic material matrix.
Abstract: Motor vehicle exhaust device or part is protected against corrosion at least internally, by coating with an adhering protective layer which contains 5-50% metallic Al-, Ni-, Fe- and/or stainless steel powder embedded in a glass or ceramic material matrix. The matrix is formed by using a frit contg. 6-50% SiO2, 5-45% B2O3, 5-15% Na2O, 4-11% Al2O3, 2-8% CaO, 0-11% TiO2, 0-8% BaO, 0-6% PbO, 0-3% MnO, 0-2% K2O and 0-2% Fe2O3. High temp.- and electrolyte corrosion resistance are improved and service life is lengthened.
1 citations