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Preparation method of mullite whisker reinforced aluminum-based ceramic core for directional solidification
The invention discloses a preparation method of a mullite whisker reinforced aluminum-based ceramic core for directional solidification. The preparation method comprises the following steps: mixing fused corundum powder used as raw material of ceramic core matrix, aluminum hydroxide powder, yttrium oxide powder, nano silicon dioxide powder, aluminum trifluoride powder and surface-treated lignin fibers for improving the porosity of the mold core, stirring and mixing with a molten plasticizer to obtain mold core slurry, and pressing to obtain a ceramic mold core blank; putting the ceramic core blank into magnesium oxide powder, carrying out four-stage sintering to burn off lignin fibers and improve the porosity, finally, carrying out impregnation with yttrium oxide sol, and then, carrying out roasting strengthening so that aluminum hydroxide and nano silicon dioxide in the ceramic core blank generate mullite whiskers in situ under the catalysis of aluminum trifluoride; therefore, the mullite whisker reinforced aluminum-based ceramic core for directional solidification of turbine blades of aero-engines and gas turbines is obtained. The obtained ceramic core can bear the high temperature of 1,550-1,700 DEG C in the directional solidification process of hollow turbine blades of large-size aero-engines and gas turbines, is small in deformation and does not crack under the high temperature gradient.
一种定向凝固用莫来石晶须增强铝基陶瓷型芯的制备方法，将作为陶瓷型芯基体原料的电熔刚玉粉、氢氧化铝粉、氧化钇粉、纳米二氧化硅粉、三氟化铝粉和表面处理后用于提升型芯的孔隙率的木质素纤维混合后与熔融后的增塑剂搅拌混合得到型芯浆料后进行压制得到陶瓷型芯坯体，再将陶瓷型芯坯体置于氧化镁粉体中并进行四阶段烧结以烧除木质素纤维的同时提升孔隙率，最后用氧化钇溶胶进行浸渍后焙烧强化，使其中的氢氧化铝和纳米二氧化硅在三氟化铝的催化下，原位生成了莫来石晶须，从而得到航空发动机和燃气轮机涡轮叶片定向凝固用莫来石晶须增强铝基陶瓷型芯。本发明得到的陶瓷型芯在大尺寸航空发动机和燃气轮机空心涡轮叶片定向凝固过程中可以承受1550℃‑1700℃的高温而变形量很小，在高温度梯度下不开裂。
Preparation method of mullite whisker reinforced aluminum-based ceramic core for directional solidification
The invention discloses a preparation method of a mullite whisker reinforced aluminum-based ceramic core for directional solidification. The preparation method comprises the following steps: mixing fused corundum powder used as raw material of ceramic core matrix, aluminum hydroxide powder, yttrium oxide powder, nano silicon dioxide powder, aluminum trifluoride powder and surface-treated lignin fibers for improving the porosity of the mold core, stirring and mixing with a molten plasticizer to obtain mold core slurry, and pressing to obtain a ceramic mold core blank; putting the ceramic core blank into magnesium oxide powder, carrying out four-stage sintering to burn off lignin fibers and improve the porosity, finally, carrying out impregnation with yttrium oxide sol, and then, carrying out roasting strengthening so that aluminum hydroxide and nano silicon dioxide in the ceramic core blank generate mullite whiskers in situ under the catalysis of aluminum trifluoride; therefore, the mullite whisker reinforced aluminum-based ceramic core for directional solidification of turbine blades of aero-engines and gas turbines is obtained. The obtained ceramic core can bear the high temperature of 1,550-1,700 DEG C in the directional solidification process of hollow turbine blades of large-size aero-engines and gas turbines, is small in deformation and does not crack under the high temperature gradient.
一种定向凝固用莫来石晶须增强铝基陶瓷型芯的制备方法，将作为陶瓷型芯基体原料的电熔刚玉粉、氢氧化铝粉、氧化钇粉、纳米二氧化硅粉、三氟化铝粉和表面处理后用于提升型芯的孔隙率的木质素纤维混合后与熔融后的增塑剂搅拌混合得到型芯浆料后进行压制得到陶瓷型芯坯体，再将陶瓷型芯坯体置于氧化镁粉体中并进行四阶段烧结以烧除木质素纤维的同时提升孔隙率，最后用氧化钇溶胶进行浸渍后焙烧强化，使其中的氢氧化铝和纳米二氧化硅在三氟化铝的催化下，原位生成了莫来石晶须，从而得到航空发动机和燃气轮机涡轮叶片定向凝固用莫来石晶须增强铝基陶瓷型芯。本发明得到的陶瓷型芯在大尺寸航空发动机和燃气轮机空心涡轮叶片定向凝固过程中可以承受1550℃‑1700℃的高温而变形量很小，在高温度梯度下不开裂。
Preparation method of mullite whisker reinforced aluminum-based ceramic core for directional solidification
定向凝固用莫来石晶须增强铝基陶瓷型芯制备方法
LI FEI (author) / MA XIN (author) / LEI SIXIONG (author) / HU BING (author) / YI CHUSHAN (author) / WANG DONGHONG (author) / SUN BAODE (author)
2020-12-08
Patent
Electronic Resource
Chinese
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