刘小磐,庞先兵,万隆,唐浩,李荣辉

• 1:湖南大学材料科学与工程学院
• 2:广东风华高科技材料股份有限公司

摘要(Abstract)：

制备了SiO_2-B_2O_3-Al_2O_3-Li_2O系CBN磨具用微晶玻璃结合剂。采用X衍射分析、热膨胀系数测试、扫描电镜、抗弯强度测试等方法研究了烧结温度对CBN微晶玻璃结合剂相组成、显微形貌和CBN磨具样品力学性能的影响。结果表明:烧结温度高于690℃烧结时,结合剂会析出β-锂霞石(Li_xAl_xSi_(1-x)O_2)相;随烧结温度升高,β-锂霞石晶粒尺寸变大,膨胀系数减小,膨胀系数在740℃达到最小值4.21×10-6K-1;当温度超过740℃时,随温度升高β-锂霞石晶粒变小,含量降低,结合剂膨胀系数增大,烧结温度为840℃时,结合剂变为纯玻璃相。在740℃烧结,结合剂的抗弯强度达到最大值147.8 MPa;在790℃下烧结,CBN砂轮试样的抗弯强度达到最大值64.8 MPa。

关键词(KeyWords)： 微晶玻璃;CBN;结合剂;烧结温度;砂轮

Abstract:

Keywords:

基金项目(Foundation): 湖南省科技计划项目(2015JC3048);; 江苏省双创人才引进项目(20140112);; 硅酸盐建筑材料国家重点实验室开放基金(SYSJJ2015-09);; 国家自然科学基金(51375157);; 上海航天八院SAST基金(2015044)

作者(Author): 刘小磐,庞先兵,万隆,唐浩,李荣辉

DOI: 10.13289/j.issn.1009-6264.2016.06.002

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