Ni-Cr合金真空预钎焊金刚石磨粒复合节块界面微结构
Interfacial microstructure of pre-brazed diamond composite segments using Ni-Cr composite alloy
-
摘要: 在Ni-Cr合金中加入A合金粉制成复合钎料,在加热温度1 050 ℃和保温时间30 min的工艺下进行金刚石磨粒的预钎焊处理试验,在加热温度810 ℃和保温时间4 min的烧结工艺下制备预钎焊磨粒复合节块. 测试预钎焊磨粒的静压强度和复合节块的抗弯强度,并分析预钎焊金刚石、复合节块的界面微结构. 结果表明,复合钎料与金刚石磨粒在预钎焊过程中形成化学结合界面,且对金刚石的热损伤较小;当磨粒浓度范围为10%~50%时,复合节块的抗弯强度均高于常规金刚石节块;预钎焊金刚石与金属胎体在烧结过程中形成冶金结合界面,复合节块界面结合强度高.Abstract: Pre-brazed diamonds were fabricated by using diamonds and Ni-Cr composite brazing alloy, which were consisted of Ni-Cr alloy and A alloy. Brazing temperature was 1 050 ℃ and the holding time was 30 min. Abrasive composite segments consisting of the pre-brazed diamonds and metal matrix were sintered at the heating temperature of 810 ℃ for the dwell time of 4 min. The static compressive strength of the pre-brazed diamonds and the bending strength of the abrasive composite segments were measured. The interfacial microstructure of the pre-brazed diamonds and the composite segments fracture surface were characterized. Results obtained show that the chemical combination interface between diamonds and Ni-Cr composite alloy was developed when pre-brazing and the thermal damage to the diamonds was greatly reduced. The bending strength of the abrasive composite segments (10%-50%) was much higher than that of the conventional segments. In the composite segments the metallurgical bonding between the pre-brazed diamonds and metal matrix was formed and the diamonds were embedded firmly.
-
-
[1] 徐西鹏, 吴 健, 沈剑云, 等. 结合剂中金刚石固位机理及提高固位能力的技术[J]. 中国有色金属学报, 1998, 8(增刊2): 8-10. Xu Xipeng, Wu Jian, Shen Jianyun, et al. The mechanism and the improving technology of diamond retention in sintering bonds[J]. Transactions of Nonferrous Metals Society of China, 1998, 8(Suppl 2): 8-10. [2] 肖 冰, 徐鸿钧, 武志斌, 等. Ni-Cr合金真空单层钎焊金刚石砂轮[J]. 焊接学报, 2001, 22(2): 23-27. Xiao Bing, Xu Hongjun, Wu Zhibin, et al. Furnace brazing of diamond grinding wheel with Ni-Cr alloy under vacuum atmosphere[J]. Transactions of the China Welding Institution, 2001, 22(2): 23-27. [3] 卢金斌, 徐九华, 徐鸿钧, 等. Ni-Cr合金真空钎焊金刚石界面反应的热力学与动力学分析[J]. 焊接学报, 2004, 25(1): 21-24. Lu Jinbin, Xu Jiuhua, Xu Hongjun, et al. Thermodynamic studies on interfacial reactions between diamond and Ni-Cr filler metal in vacuum brazing[J]. Transactions of the China Welding Institution, 2004, 25(1): 21-24. [4] 卢金斌, 汤 峰, 孟 普, 等. Ni-Cr合金真空钎焊金刚石的热损伤分析[J]. 焊接学报, 2010, 31(8): 25-28. Lu Jinbin, Tang Feng, Meng Pu, et al. Thermal damage analysis of vacuum brazing diamond with Ni-Cr alloy[J]. Transactions of the China Welding Institution, 2010, 31(8): 25-28. [5] 苏宏华. 新型金属结合剂金刚石工具技术的基础研究[D]. 南京: 南京航空航天大学博士学位论文, 2007. [6] 孙毓超, 刘一波, 王秦生. 金刚石工具与金属学基础[M]. 北京: 中国建材工业出版社, 1999.
计量
- 文章访问数: 364
- HTML全文浏览量: 20
- PDF下载量: 255
下载:
