摘要:
The invention relates to a method for obtaining a structure made from a porous ceramic material containing at least 95% silicon carbide SiC, said method being characterised in that the structure is obtained from a mixture of SiC grains comprising at least: a first fraction of α-SiC grains having a median diameter of less than 5 micrometers, a second fraction of α-SiC grains having a median diameter which is at least twice that of the first fraction of α-SiC grains and is greater than or equal to 5 micrometers, and a fraction of β-SiC grains or at least one precursor of β-SiC grains. The invention also relates to the resulting porous structure.
摘要:
An obj ect of the present invention is to provide a method for manufacturing a material for a silicon carbide fired body suitably used for manufacturing a porous silicon carbide sintered body, the material containing iron compound powders uniformly distributed therein, the method comprising a process of wet mixing, or wet-pulverizing and wet-mixing at least a silicon carbide powder and an iron compound powder.
摘要:
A flat honeycomb structure exhibiting sufficient resistance against physical impact in which a sealing material layer is insusceptible to damage at the time of temperature rise and bonding strength can be maintained. The honeycomb structure has honeycomb units principally made of porous ceramic and having a large number of through holes arranged in the longitudinal direction and separated by partitions and a sealing material layer provided at the outer peripheral part of a plurality of flat ceramic blocks bonded through sealing material layers. The honeycomb structure is characterized in that the pattern of the sealing material layer between the honeycomb units in the cross-section perpendicular to the longitudinal direction is formed obliquely to the major axis of a shape forming the outline of the cross-section.
摘要:
It is an obj ect of the present invention to provide a method for inspecting a honeycomb structured body that is less influenced by measurement conditions and is able to measure the shape of a honeycomb structured body in the longitudinal direction accurately and in a short period of time. The method for inspecting a honeycomb structured body of the present invention is a method for inspecting a honeycomb structured body comprised of a pillar-shaped honeycomb fired body having a multitude of cells placed in parallel with one another in the longitudinal direction with a cell wall between, the method comprising: measuring the shape of the honeycomb structured body in the longitudinal direction through preparing a contact measurement apparatus including a reference surface, a rail established perpendicular to the reference surface, and a measurement probe including a contacting probe configured to move along the rail; contacting one end face of the honeycomb structured body with the reference surface; and moving the measurement probe in a direction nearing the reference surface to contact the contacting probe with the other end face of the honeycomb structured body.
摘要:
The invention relates to the use of an SiC-based composite refractory material as an inner coating for an aluminium smelting furnace or as a coating for a fused salt electrolytic cell. Said material contains inclusions, comprising at least one a-SiC part, in a ß-SiC matrix.
摘要:
Carbon-Keramik-Bremsscheiben, die mehrere Schichten umfassen, wobei mindestens eine Schicht als Tragkörper dient und mindestens eine Schicht als Reibschicht fungiert, wobei der Tragkörper und mindestens eine Reibschicht durch eine Zwischenschicht getrennt sind, dadurch gekennzeichnet, daß die Zwischenschicht Verstärkungsfasern in Form von Faserbündeln aufweist, wobei die Faserbündel von einer Schicht aus einer Mischung von Siliciumcarbid, Silicium und Kohlenstoff umgeben sind, die durch thermische Behandlung einer Mischung aus Silicium-Pulver und einem carbonisierten Harz oder carbonisierten Pech bei einer Temperatur von 900 °C bis 1700 °C unter Ausschluß von Oxydationsmitteln erhältlich ist, Verfahren zu deren Herstellung, und Verwendung insbesondere in Bremssystemen von Automobilen
摘要:
A method of producing a silicon carbide sintered body for heaters, which contains 500 ppm or more of nitrogen, including obtaining slurry-like mixed powder obtained by dispersing silicon carbide powder in a solvent; obtaining a green body by pouring the mixed powder in a shaping die followed by drying; first heating step of heating the green body under a vacuum atmosphere up to a temperature in the range of 550 to 650°C; andsecondheatingstepof, after further heating to a temperature equal to or higher than 1500°C under a nitrogen gas atmosphere, holding at the temperature under the nitrogen gas atmosphere to obtain a silicon carbide sintered body. And a silicon carbide sintered body for heaters, which has a nitrogen content of 500 ppm or more and the porosity of 32% by volume or less.
摘要:
A silicon carbide-containing particle that contains silicon carbide is provided, wherein the silicon carbide contains at least one of silicon carbide with polymorph 6H and silicon carbide with polymorph 15R and a total content of the silicon carbide with polymorph 6H and the silicon carbide with polymorph 15R in the silicon carbide is 70 % or more by weight. A method of manufacturing a silicon carbide-based sintered object using the silicon carbide-containing particle, a silicon carbide-based sintered object that can be obtained by using the silicon carbide-containing particle, and a filter that includes the silicon carbide-based sintered object are also provided.
摘要:
A high-response, wide-range thermistor material which has linear temperature resistance characteristics and a high rate of change in the temperature resistance in a wide temperature range from room temperature or below to above 1000 °C. The thermistor material comprises a matrix of an electrically insulating ceramic and second-phase particles discontinuously dispersed in the matrix, and the second-phase particles are semiconductive or conductive and comprise a material having a high rate of change in the temperature resistance. Further, at least one additive for regulating the electric resistance, selected among nitrides, borides, silicides, sulfides, oxides, and carbides of group IVa-VIa and IIb-Vb elements, third-phase particles having a lower modulus of elasticity than the matrix and the second phase particles and having the effect of relaxing the internal stress, and a resistance stabilizer comprising TiO2 and/or TinO2n-1 (wherein n is 4 to 9) may be added.
摘要:
An integral ceramic filter assembly (39) is produced by adhering with a ceramic seal layer (15) outer surfaces of a plurality of filters (F1). Each of the filters is formed from a sintered porous ceramic body made of α-silicon carbide and having a specific ratio of filter length to filter cross-section. The ceramic filter assembly has a ceramic smoothing layer (16) applied to the outer surface of the assembly, which as a whole has a generally circular cross-section or generally oval cross-section. Also disclosed is an exhaust gas purification apparatus including the filter assembly.