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Whisker oriented toughened white silicon nitride ceramic and preparation method thereof
The method comprises the following steps: by taking alpha-silicon nitride as a raw material and yttrium oxide, magnesium oxide and silicon oxide as additives, carrying out ball milling, drying, grinding and sieving to obtain white mixed powder; loading the white mixed powder and the boron nitride whiskers into a stainless steel grinding tool by adopting a laminating process, carrying out dry-pressing molding to obtain a dry-pressed biscuit, and carrying out cold isostatic pressing to obtain a molded biscuit; putting the molded biscuit into a boron nitride crucible, filling and coating with boron nitride powder, putting the boron nitride crucible into a vacuum furnace, performing first-step low-temperature pressureless sintering, cooling to obtain a whisker directional toughened white silicon nitride ceramic block easy to process, processing into a target shape, putting into the boron nitride crucible, filling and coating with boron nitride powder, and performing second-step low-temperature pressureless sintering to obtain the whisker directional toughened white silicon nitride ceramic block easy to process. And placing the boron nitride crucible in a vacuum furnace for second-step high-temperature pressureless sintering, and cooling to obtain a target product. The method is simple in process, low in energy consumption, easy to process into complex shapes and white in appearance.
本发明公开了一种晶须定向增韧白色氮化硅陶瓷及其制备方法，该方法包括：α‑氮化硅为原料，氧化钇、氧化镁、氧化硅为添加剂，球磨，干燥，研磨后过筛得到白色混合粉料；将白色混合粉料、氮化硼晶须采用层叠工艺装入不锈钢磨具中，干压成型得到干压素坯，冷等静压得到成型素坯；将成型素坯放入氮化硼坩埚中并用氮化硼粉体填埋包覆，将氮化硼坩埚置于真空炉中第一步低温无压烧结，冷却后得到可易于加工的晶须定向增韧白色氮化硅陶瓷块，加工成目标形状后放入氮化硼坩埚中并用氮化硼粉体填埋包覆，将氮化硼坩埚置于真空炉中进行第二步高温无压烧结、冷却后得到目标产品。该方法工艺简单、能耗低、易加工成复杂形状且具有白色外观。
Whisker oriented toughened white silicon nitride ceramic and preparation method thereof
The method comprises the following steps: by taking alpha-silicon nitride as a raw material and yttrium oxide, magnesium oxide and silicon oxide as additives, carrying out ball milling, drying, grinding and sieving to obtain white mixed powder; loading the white mixed powder and the boron nitride whiskers into a stainless steel grinding tool by adopting a laminating process, carrying out dry-pressing molding to obtain a dry-pressed biscuit, and carrying out cold isostatic pressing to obtain a molded biscuit; putting the molded biscuit into a boron nitride crucible, filling and coating with boron nitride powder, putting the boron nitride crucible into a vacuum furnace, performing first-step low-temperature pressureless sintering, cooling to obtain a whisker directional toughened white silicon nitride ceramic block easy to process, processing into a target shape, putting into the boron nitride crucible, filling and coating with boron nitride powder, and performing second-step low-temperature pressureless sintering to obtain the whisker directional toughened white silicon nitride ceramic block easy to process. And placing the boron nitride crucible in a vacuum furnace for second-step high-temperature pressureless sintering, and cooling to obtain a target product. The method is simple in process, low in energy consumption, easy to process into complex shapes and white in appearance.
本发明公开了一种晶须定向增韧白色氮化硅陶瓷及其制备方法，该方法包括：α‑氮化硅为原料，氧化钇、氧化镁、氧化硅为添加剂，球磨，干燥，研磨后过筛得到白色混合粉料；将白色混合粉料、氮化硼晶须采用层叠工艺装入不锈钢磨具中，干压成型得到干压素坯，冷等静压得到成型素坯；将成型素坯放入氮化硼坩埚中并用氮化硼粉体填埋包覆，将氮化硼坩埚置于真空炉中第一步低温无压烧结，冷却后得到可易于加工的晶须定向增韧白色氮化硅陶瓷块，加工成目标形状后放入氮化硼坩埚中并用氮化硼粉体填埋包覆，将氮化硼坩埚置于真空炉中进行第二步高温无压烧结、冷却后得到目标产品。该方法工艺简单、能耗低、易加工成复杂形状且具有白色外观。
Whisker oriented toughened white silicon nitride ceramic and preparation method thereof
一种晶须定向增韧白色氮化硅陶瓷及其制备方法
07.06.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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