Properties and applications of Ti-coated diamond grits
Properties and applications of Ti-coated diamond grits
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DOI：
10.1016/s0924-0136(02)00661-1
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发表时间：
2002-10-11
影响因子：
6.3
通讯作者：
Zheng, YZ
中科院分区：
文献类型：
--
作者：
Wang, YH;Zang, JB;Zheng, YZ
采用真空慢气相沉积法在金刚石磨粒表面镀上金属Ti。利用扫描电镜（SEM）和掠入射x射线衍射（GIXD）研究了Ti涂层的表面和界面特征。采用单粒法测定了ti包覆金刚石磨粒的强度，并用差热分析法研究了其热稳定性。采用涂钛金刚石磨粒和铁基金属结合剂制备了金刚石叶片，并进行了锯切实验。利用体视显微镜观察了工作面上涂层金刚石磨粒的形貌。结果表明：涂层后金刚石磨粒强度有所提高，最大增幅达20%左右；涂层还可以保护金刚石不被氧化，涂层后的金刚石氧化温度高达1024℃。与未涂覆的金刚石磨粒相比，涂覆后的金刚石磨粒在叶片中的拔出率从60%急剧下降到20%，突出高度也大大增加。由于Ti涂层在烧结过程中对金刚石的保护作用，涂层金刚石在烧结工具中从金属基体中侵蚀出来的强度比未涂层金刚石高24-50%。叶片寿命提高36%。降低金刚石磨粒浓度或使用细金刚石磨粒可降低金刚石工具的制造成本。(C) 2002 Elsevier Science B.V.版权所有
Diamond grits were coated with metal Ti by the vacuum slow vapor deposition method. The surface and interface characteristics of the Ti coating were studied using SEM and grazing incidence X-ray diffraction (GIXD). The strength of the Ti-coated diamond grits was measured by the single grit method and the thermal stability was investigated by differential thermal analysis. A diamond blade was produced with Ti-coated diamond grits and an Fe-based metal bond, and a sawing experiment was carried out. The configuration of the coated diamond grits on the working face was observed by use of a stereomicroscope. The results show that diamond grit strength improves after coating, the maximum increment reaching about 20%. The coating also can protect the diamond from oxidization, the oxidation temperature of the coated diamond grits reaching as high as 1024 degreesC. In comparison with un-coated diamond grits, the pull-out ratio of the coated diamond grits in the blade decreases dramatically from 60 to 20% and the protrusion height increases greatly also. Owing to the protection of the Ti coating on the diamond during sintering, the strength of the coated diamond eroded from the metal matrix is 24-50% higher than that of un-coated diamond in sintered tools. The blade life increases by 36%. Reducing the diamond grits concentration or using fine diamond grits can reduce the manufacturing cost of diamond tools. (C) 2002 Elsevier Science B.V. All rights reserved.