钾长石为助烧剂对β-SiC超精油石性能的影响

Influence of potash feldspar as sintering aid onβ-SiC super oil stone property

以β-SiC为主料,钾长石、硼玻璃、刚玉混合粉为烧结助剂,精萘作为造孔剂,采用低温无压烧结制备β-SiC超精油石。通过SEM、煮沸法、万能试验机及洛氏硬度测定等测试手段对油石试样的微观形貌、气孔率、密度、抗弯强度及硬度进行了表征,探索了钾长石质量分数的变化对β-SiC超精油石气孔率、密度、抗弯强度和硬度的影响,并且从微观结构方面探究了其变化的机理。结果表明:当钾长石含量为11%(wt,质量分数)时,超精油石气孔率为40.39%,密度为1.48g/cm^3、抗弯强度为27.17MPa,洛氏硬度为41.94HRB,达到最佳水平。

β-SiC super oil stones were prepared by low-temperature pressureless method,withβ-SiC powders as the main ingredient,naphthalene as the porous agent,and mixing sintering aids composed of potash feldspar,borosilicate glass and corundum.The microstructure,porosity,density,flexural strength and hardness of super oil stone were examined by XRD,SEM,boiling method,universal testing machine and Rockwell hardness tester,so as to explore the effects of potash feldspar content on the porosity,density,flexural strength and hardness of samples.The results showed that the oil stone achieved the best comprehensive properties,with the the porosity of 40.39%,the density of 1.48g/cm^3,the flexural strength of 27.17 MPa,and the hardness of 41.94 HRB,respectively,when the addition ratio of potash feldspar was 11wt%.