Ceramic sintered body, corrosion-resistant member made of same, filter and anti-halation member
A technology of sintered body and ceramics, which is applied in the direction of ceramic products, applications, household appliances, etc., can solve the problem of discoloration of sintered body, and achieve the effect of inhibiting discoloration and excellent thermal shock resistance
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Embodiment 1
[0089] First, prepare the average particle size (D 50 ) is a powder of metal silicon of 3 μm, and the average particle size (D 50 ) is 1 μm, and the powder of silicon nitride whose beta conversion rate is 10% (that is, the beta conversion rate is 90%) is mixed so that the mass ratio of metal silicon powder / silicon nitride powder is 5.4 to obtain a mixed powder . Here, in the powder of metal silicon, when the sum of the cumulative volume of the particle size distribution curve is 100%, the cumulative volume is 90% of the particle diameter (D 90 ) is 5 μm.
[0090] Next, the powders of alumina, calcium carbonate and magnesium aluminate, and the powder of ferric oxide are put into the barrel mill together with the pulverization medium composed of the above mixed powder, water and silicon nitride sintered body. , by adjusting the outer diameter, amount and pulverization time of the pulverization medium, mixing and pulverization is carried out until the specific surface area of ...
Embodiment 2
[0104] Next, each powder of the metal oxide, calcium carbonate, and magnesium aluminate shown in Table 2 was used as an additive, and the metal oxide was adjusted to the content shown in Table 2 in the total 100% by mass of the mixed powder and the additive. Calcium was 11.3% by mass, and magnesium aluminate was 2.6% by mass. By the same method as the production method of Sample No. 3, a bottomed cylindrical molded body was obtained.
[0105] In addition, the compact was placed in a mortar made of silicon carbide, and held at 500° C. for 5 hours in a nitrogen atmosphere to perform degreasing. Next, the temperature was further raised, and the nitrogen partial pressure of 150 kPa consisting essentially of nitrogen was maintained at 1050° C. for 20 hours and then at 1250° C. for 10 hours to nitridize. Then, the temperature was further raised, and the firing temperature shown in Table 2 was kept for 12 hours, and the pressure of nitrogen was made normal pressure, fired, and cooled...
Embodiment 3
[0114] At first, with the same method of the preparation method of sample No.14,16 respectively, make in surface layer ratio {(I 1 +I 2 ) / I 0 Sample Nos. 28 and 29 where ×100} was 4% or more were both 5 mm thick and 15 mm square substrates.
[0115] However, the forming method is not the CIP forming method, but the uniaxial extrusion forming method.
[0116] Also, make the ratio {(I 1 +I 2 ) / I 0 ×100} less than 4% of sample No.30. First, the molded body of sample No. 30 was produced in the same manner as the molded body of sample No. 16. Next, the compact of sample No. 30 was placed in a mortar made of silicon carbide, and held at 500° C. for 5 hours in a nitrogen atmosphere to perform degreasing. Next, the temperature was further increased, and nitrogen partial pressure of 150 kPa consisting essentially of nitrogen was maintained at 1050° C. for 20 hours and at 1250° C. for 10 hours in order to be nitrided. Thereafter, the temperature was further raised, kept at 1730°...
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