添加剂对金刚石磨具用陶瓷结合剂性能的影响  

Effect of Additives on Properties of Vitrified Bond Used in Diamond Abrasive Tools

作　　者：李青[1] 尹育航[1,2] 薛群虎[1] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]广东奔朗新材料股份有限公司,佛山528313

出　　处：《硅酸盐通报》2013年第1期113-116,共4页Bulletin of the Chinese Ceramic Society

基　　金：国家重点学科培育学科资助项目

摘　　要：本文采用三元碱R2O-Al2O3-B2O3-SiO2系为基础陶瓷结合剂(编号1#),添加适量的碱土金属氧化物MgO、ZnO和氟化物CaF2(编号2#)以及在此基础上外加适量的稀土金属氧化物CeO2(编号3#),制备出1#、2#和3#三种陶瓷结合剂,研究添加剂对陶瓷结合剂性能的影响。结果表明:在640℃下烧结,2#陶瓷结合剂试样抗折强度达到87.69 MPa,较1#陶瓷结合剂试样提高了50.7%,熔融温度从840℃降到770℃;而3#陶瓷结合剂试样在该烧结温度下抗折强度达到92.05 MPa,较1#陶瓷结合剂试样提高了53.1%,熔融温度降到730℃,高温润湿性良好;2#陶瓷结合剂和3#陶瓷结合剂都有新晶相锂霞石生成,其热膨胀系数都明显低于1#陶瓷结合剂。将此三种陶瓷结合剂在相同的工艺条件下制备成金刚石磨具,其中用3#陶瓷结合剂制备的金刚石磨具抗折强度和洛氏硬度明显高于另外两种陶瓷结合剂,分别达到59.34 MPa和60。This paper studied effect of additives on properties of vitrified bond used in diamond abrasive tools. Three vitrified bonds were made, namely bond No. 1 by using tribasic base R2O-Al2O3-B2O3-SiO2 as basic vitrified bond, bond No. 2 by adding appropriate alkali metal oxide MgO, ZnO and fluoride CaF2 in the bond No. 1, and bond No. 3 by adding appropriate rare-earth metal oxide CeO2 in the bond No. 2. The experimental results showed that the bending strength of the bond No. 2 and No. 3, sintered at 640℃, reached to 87.69 MPa and 92.05 MPa respectively, or 50.7% and 53.1% higher than that of the bond No. 1. The melting temperatures for the bond No. 2 and No. 3 were reduced to 770 ℃ and 730℃ respectively from 840℃ of the bond No. 1. The new crystalline phase, eucryptite, were found in both the bond No. 2 and No. 3 which resulted in lower thermal expansion coefficients for the two bonds. In addition, the bond No. 3 had got better wettablility for diamond at sintering temperature. The samples of diamond abrasive tools were prepared with the above mentioned bonds respectively in the same conditions and some experimental data were discussed. The bending strength and rockwell hardness of diamond abrasive tools made of No. 3 vitrified bond was significantly higher than the other vitrified bonds, respectively reached 59.34 MPa and 60.

关 键 词：金刚石磨具 陶瓷结合剂 碱土金属化合物 稀土氧化物CeO2 

分 类 号：TB321[一般工业技术—材料科学与工程]