冰刀用高强韧Si_(3)N_(4)陶瓷的制备与性能研究  

Preparation and Properties of High Strength and Toughness Silicon Nitride Ceramics for Ice Skates

作　　者：张诚 张光磊 郝宁 于刚 秦国强 ZHANG Cheng;ZHANG Guanglei;HAO Ning;YU Gang;QIN Guoqiang(School of Materials Science and Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学材料科学与工程学院,石家庄050043

出　　处：《硅酸盐通报》2022年第12期4425-4431,共7页Bulletin of the Chinese Ceramic Society

基　　金：河北省技术创新引导计划(20471101D)。

摘　　要：以α-Si_(3)N_(4)粉为原料,MgO-La_(2)O_(3)-Lu_(2)O_(3)为三元复合烧结助剂,采用气压烧结工艺制备Si_(3)N_(4)陶瓷条,研究烧结助剂及添加β-Si3N4增强相对Si3N4陶瓷微观结构及力学性能的影响。结果表明,三元复合烧结助剂促进了烧结的致密化,提高了材料的力学性能,在最高烧结温度1 750℃、复合烧结助剂添加量8%(质量分数)时,得到密度为3.172 8 g/cm^(3)、维氏硬度达到15.85 GPa、断裂韧性和抗弯强度分别为9.69 MPa·m^(1/2)和1 029 MPa的冰刀用Si_(3)N_(4)陶瓷。添加β-Si_(3)N_(4)材料的断裂韧性得到提高,最高达到10.33 MPa·m^(1/2)。Si_(3)N_(4)陶瓷本身的高硬度与加入的稀土氧化物使得所制备冰刀的硬度与润滑性能得到提高,表面性能优良。Silicon nitride ceramic strips were prepared by air pressure sintering process with α-Si_(3)N_(4) powder as raw material and MgO-La_(2)O_(3)-Lu_(2)O_(3) as ternary composite sintering aids. The effects of sintering aids and β-Si_(3)N_(4) on the microstructure and mechanical properties of silicon nitride ceramics were studied. The results show that the ternary composite sintering aids promote the densification of sintering and improve the mechanical properties of the materials. At the highest sintering temperature of 1 750 ℃ and the addition of 8%(mass fraction) composite sintering aids, the silicon nitride ceramics for ice skates with density of 3.172 8 g/cm^(3), Vickers hardness of 15.85 GPa, fracture toughness and bending strength of 9.69 MPa·m^(1/2)and 1 029 MPa can be obtained. The fracture toughness of the material is enhanced by adding β-Si_(3)N_(4), and the maximum fracture toughness is 10.33 MPa·m^(1/2). The high hardness of Si_(3)N_(4) ceramics itself and the addition of rare earth oxides improve the hardness and lubricating properties of the prepared ice skates, and the surface properties of ice skates are excellent.

关 键 词：冰刀 Si_(3)N_(4)陶瓷 稀土 三元复合助剂 气压烧结 力学性能 

分 类 号：TQ174[化学工程—陶瓷工业]