【摘要】 采用溶胶-凝胶法,对精加工的氮化物复合材料进行AlPO4-Si3N4涂层处理后,表面非常致密,可防止基体因长期放置而吸潮。由于AlPO4-Si3N4溶胶-凝胶有效地弥合基体表面的微裂纹,且浸入到基体内部约34μm深,与基体形成交叉咬合,使材料整体性能增加。材料表面改性实验表明,Al-PO4-Si3N4溶胶-凝胶涂层处理后,材料密度增加,表面气孔率降低,强度由原来的60MPa增加为85MPa,断裂韧性由1.1MPam1/2增加为1.9MPam1/2。更多还原

【Abstract】 After finish machining nitride composite is treated with AlPO4-Si3N4 coating adopted Sol-Gel,surface is compacted,which prevented substrates absorption of moisture because of placement long time.With AlPO4-Si3N4 can close the substrate’s microcrack effectively,and immerge to substrate inner 34 μm,and occlude each other with the substrate,the whole performances is reinforced.Materials surface modified experiment shows:After AlPO4-Si3N4 coating treatment,materials density increased,surface porosity decreased,strength add to 85 MPa from 60 MPa,fracture toughness add to 1.9 MPa·m1/2from 1.1 MPa·m1/2.更多还原