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Preparation method of high-reliability long-life silicon nitride ceramic ball for aircraft bearing
The invention provides a preparation method of a high-reliability long-service-life silicon nitride ceramic ball for an aircraft bearing, and belongs to the technical field of silicon nitride ceramicball manufacturing. Metal organic salt (aluminum isopropoxide and metal acetate) is used as a precursor of a sintering aid, and the surface of silicon nitride can be coated with the sintering aid through hydrolysis, spray drying and calcination processes, so that uniform dispersion of the sintering aid in silicon nitride is realized; therefore, the reduction of reliability and fatigue life of theceramic ball caused by agglomeration and segregation of the sintering aid is avoided. The result of the embodiment shows that the density of the silicon nitride ceramic ball prepared by the method reaches 99.9% or above, the Vickers hardness (HV10) is larger than 1500, the crushing load ratio is larger than 45%, the Weibull modulus is larger than 15, the rolling contact fatigue life (RCF) is 400 hor above, and the silicon nitride ceramic ball is particularly suitable for manufacturing rolling elements for aviation bearings.
本发明提供了一种航空轴承用高可靠性长寿命氮化硅陶瓷球的制备方法，属于氮化硅陶瓷球制造技术领域。本发明以金属有机盐(异丙醇铝和金属醋酸盐)作为烧结助剂的前驱体，通过水解、喷雾干燥和煅烧工艺，能够使烧结助剂包覆在氮化硅表面，实现烧结助剂在氮化硅中的均匀分散，从而避免因烧结助剂的团聚和偏析而导致陶瓷球可靠性及疲劳寿命的下降。实施例的结果表明，本发明所述方法制备的氮化硅陶瓷球致密度达到了99.9％以上，维氏硬度(HV10)大于1500，压碎载荷比大于45％，韦布尔模数大于15，滚动接触疲劳寿命(RCF)在400h以上，特别适合用来制造航空轴承用滚动元件。
Preparation method of high-reliability long-life silicon nitride ceramic ball for aircraft bearing
The invention provides a preparation method of a high-reliability long-service-life silicon nitride ceramic ball for an aircraft bearing, and belongs to the technical field of silicon nitride ceramicball manufacturing. Metal organic salt (aluminum isopropoxide and metal acetate) is used as a precursor of a sintering aid, and the surface of silicon nitride can be coated with the sintering aid through hydrolysis, spray drying and calcination processes, so that uniform dispersion of the sintering aid in silicon nitride is realized; therefore, the reduction of reliability and fatigue life of theceramic ball caused by agglomeration and segregation of the sintering aid is avoided. The result of the embodiment shows that the density of the silicon nitride ceramic ball prepared by the method reaches 99.9% or above, the Vickers hardness (HV10) is larger than 1500, the crushing load ratio is larger than 45%, the Weibull modulus is larger than 15, the rolling contact fatigue life (RCF) is 400 hor above, and the silicon nitride ceramic ball is particularly suitable for manufacturing rolling elements for aviation bearings.
本发明提供了一种航空轴承用高可靠性长寿命氮化硅陶瓷球的制备方法，属于氮化硅陶瓷球制造技术领域。本发明以金属有机盐(异丙醇铝和金属醋酸盐)作为烧结助剂的前驱体，通过水解、喷雾干燥和煅烧工艺，能够使烧结助剂包覆在氮化硅表面，实现烧结助剂在氮化硅中的均匀分散，从而避免因烧结助剂的团聚和偏析而导致陶瓷球可靠性及疲劳寿命的下降。实施例的结果表明，本发明所述方法制备的氮化硅陶瓷球致密度达到了99.9％以上，维氏硬度(HV10)大于1500，压碎载荷比大于45％，韦布尔模数大于15，滚动接触疲劳寿命(RCF)在400h以上，特别适合用来制造航空轴承用滚动元件。
Preparation method of high-reliability long-life silicon nitride ceramic ball for aircraft bearing
一种航空轴承用高可靠性长寿命氮化硅陶瓷球的制备方法
ZHANG JING (author) / WANG WENXUE (author) / LIU LU (author) / SUN FENG (author) / YAN JIASEN (author) / SONG JIAN (author) / YANG WENWU (author) / YANG KAINING (author) / LIU FUBING (author) / YU ANLE (author)
2020-12-04
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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