【摘要】 提出在Fe-Mo/Si₃N₄金属陶瓷中添加Mg、Y氧化物,在常压烧结条件下实现金属复合、晶须技术双重强韧化陶瓷,并研究了Mg、Y氧化物对Fe-Mo/Si₃N₄金属陶瓷的微观组织与性能的影响.结果表明:添加Mg、Y氧化物的Fe-Mo/Si₃N₄金属陶瓷,存在与Si₃N₄润湿性极好的金属Fe与MoSi₂相,颗粒状α-Si₃N₄转变成晶须条状β-Si₃N₄,烧结体致密且晶粒得到明显细化,各项性能得到大幅提升,实现了金属复合、晶须技术双重强韧化Si₃N₄陶瓷。更多还原

【Abstract】 The paper proposes a dual-toughening method of ceramic,including metal composite and crystal whiskers strengthening,through adding Mg-Y oxides into Fe-Mo/Si₃N₄ cermet and subsequently consolidated by normal pressure sintering.The effects of Mg-Y oxides on the microstructure and properties of the Fe-Mo/Si₃N₄ cermet have been investigated.The results show that Fe and MoSi₂ phases with good wettability on Si₃N₄ are formed in the Fe-Mo/Si₃N₄ cermet with Mg-Y oxides addition.Additionally, granularα-Si₃N₄ converts into whisker-shapedβ-Si₃N₄,simultaneously with obvious densification,grain refinement and significantly improved properties,indicating that the dual-toughening method of the metal composite and the crystal whiskers have been realized.更多还原