A kind of silicon nitride-resin dual continuous phase composite ceramic material and its manufacturing method and application
一种双连续相、复合陶瓷的技术，应用在材料领域，能够解决不具备棒状晶粒结构、很难达到强度等问题，达到可加工性好、工艺简单易行、强度高的效果
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Embodiment 1
[0055] (1) The mixed powder comprising silicon nitride powder and sintering aid powder (yttrium oxide is used as the sintering aid, and the sintering aid accounts for 5% of the mass of the powder) is press-molded under a pressure of 12 MPa using a press molding process , and then perform cold isostatic pressing under a pressure of 280MPa to obtain a green body;
[0056] (2) The green body was placed in a nitrogen atmosphere furnace, sintered at 1700° C., and kept for 2 hours. At this time, the bending strength of the ceramic body was measured to be 212.2 MPa, and the porosity was 39.5%.
[0057] (3) Place the ceramic green body in 5% ethanol solution of silane coupling agent (γ-methacryloxypropyltrimethoxysilane), soak for 3 hours, then take it out and dry it in the air, and dry it at 120°C for 30min , to obtain a surface-treated ceramic green body;
[0058] (4) Place the ceramic green body in PMMA resin, carry out atmospheric pressure infiltration treatment, and take it out ...
Embodiment 2
[0063] (1) The mixed powder comprising silicon nitride powder and sintering aid powder (as yttrium oxide, the sintering aid accounts for 5% of the mass of the powder) is formulated into a 50wt% slurry by using the pouring molding process. As a solvent, silicon nitride ceramic green bodies are then produced through a casting process;
[0064] (2) The ceramic green body was placed in a nitrogen atmosphere furnace, sintered at 1700° C., and kept for 2 hours. At this time, the bending strength of the ceramic body was measured to be 171.75 MPa, and the porosity was 49.3%. The microscopic morphology of the obtained porous silicon nitride ceramics is as follows: figure 2 shown. from figure 2 It can be seen that porous silicon nitride has a uniform long rod-shaped grain morphology, and a uniform and connected porous structure. The connected porous structure is conducive to the penetration and compounding of the resin material, and the long rod-shaped grain structure is conducive ...
Embodiment 3
[0070] (1) The mixed powder comprising silicon nitride powder and sintering aid powder (yttrium oxide is used as sintering aid, accounting for 5% of the mass of the powder) is prepared into a 60wt% slurry by using the pouring molding process. As a solvent, silicon nitride ceramic green bodies are then produced through a casting process;
[0071] (2) The ceramic green body was placed in a nitrogen atmosphere furnace, sintered at 1700° C., and kept for 2 hours. At this time, the bending strength of the ceramic body was measured to be 262.25 MPa, and the porosity was 45.1%.
[0072] (3) Place the ceramic green body in 5% ethanol solution of silane coupling agent (γ-methacryloxypropyltrimethoxysilane), soak for 3 hours, then take it out and dry it in the air, and dry it at 120°C for 30min , to obtain a surface-treated ceramic green body;
[0073] (4) Place the ceramic green body in PMMA resin, carry out atmospheric pressure infiltration treatment, and take it out after 24 hours. ...
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