烧结温度对玻璃/金属复合结合剂金刚石磨具磨削性能的影响  

Effect of Sintering Temperature on Grinding Performance of Glass/Metal Composite Bond Diamond Wheel

作　　者：宋冬冬[1] 万隆[1] 刘小磐[1] 胡伟达[2] 谢德龙[1] 

机构地区：[1]湖南大学,湖南长沙410082 [2]湖南工业大学,湖南株洲412007

出　　处：《稀有金属材料与工程》2017年第4期1054-1060,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51375157)

摘　　要：在不同温度下,采用热压烧结法制备了含3%(质量分数,下同)Na_2O-B_2O_3-SiO_2-Al_2O_3-Li_2O脆性玻璃结合剂的玻璃/金属复合结合剂金刚石磨具,通过扫描电子显微镜、能谱仪、X射线衍射仪、XPS、洛氏硬度计、抗折强度试验机、气动圆度测试仪等研究了烧结温度对复合结合剂微观结构、力学及磨削性能的影响。结果表明:随着烧结温度提高,玻璃相发生球形—椭球形—长条状—片层状的形状变化。烧结温度为850℃时,金属与玻璃间出现10~20 nm FeAl_2O_4过渡层,强化了两者界面结合,复合结合剂抗折强度达到最大值826 MPa,硬度为94 HRB。烧结温度为900℃时,脆性FeAl_2O_4过渡层增厚导致抗折强度下降。烧结温度为850℃时,金属结合剂磨具与添加3%玻璃结合剂的金刚石磨具相比,加工气缸圆度和直线度平均值分别由3.1μm和2.5μm降低至2.7μm和2.1μm。The metal bond diamond wheels with 3 wt% brittle Na2O-B2O3-SiO2-Al2O3-Li2O glass bond addition were fabricated by a hot pressed sintering technique at different sintering temperatures. The effects of different sintering temperatures on the microstructure interface structure, hardness and the bending strength of glass/metal composite bond were investigated by the methods of scan-electroscope, energy spectrum analysis, X-diffraction analysis, XPS analysis, rockwell hardness test and three-point bending test Meanwhile, the grinding performance of cylinder of the diamond wheels was also studied. The results show that a transformation occurs from spherical, elliptic, strip to lamellar with the increase of sintering temperature. At 850 ℃, a thin 10-20 nm FeAl2O4 transition layer is formed and it enhances the interracial adhesion toughness between metal and ceramic phase, and the bending strength of the composite bond reaches the maximum value 826 MPa, and the hardness is HRB 94. At 900 ℃, the brittle and thickening FeAl2O4 transition layer decreases the bending strength of the composite bond. When the sintering temperature is 850 ℃, comparing with that of metal bond diamond wheel, the average value of the roundness and straightness of the cylinder ground by the composite bond diamond wheel declines from 3.1 μm to 2.7 μm and from 2.5 Ixm to 2.1μm, respectively

关 键 词：玻璃/金属复合结合剂 烧结温度 界面结构 抗折强度 圆度 直线度 

分 类 号：TG74[金属学及工艺—刀具与模具]