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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。
At different temperatures, a glass / metal composite diamond abrasive containing 3% (mass fraction) of the glass-ceramic composite binder was prepared by hot-pressing sintering method and characterized by scanning electron microscopy , Energy dispersive spectrometer, X-ray diffraction, XPS, Rockwell hardness tester, flexural strength tester, pneumatic roundness tester and so on. The results show that with the increase of sintering temperature, the shape of spheroidal-ellipsoidal-elongated-lamellar glass phase changes. When the sintering temperature is 850 ℃, the transition layer of 10 ~ 20 nm FeAl_2O_4 exists between the metal and the glass, which strengthens the interface between the two. The flexural strength reaches 826 MPa and the hardness reaches 94 HRB. When the sintering temperature is 900 ℃, the brittleness of FeAl_2O_4 transitional layer leads to the decrease of the flexural strength. When the sintering temperature is 850 ℃, the average value of the roundness and straightness of the machined cylinder decreases from 3.1μm and 2.5μm to 2.7μm and 2.1μm, respectively, compared with the diamond abrasive with 3% glass binder added.