Study on the properties of diamond saw blades prepared by Cu-based pre-alloyed powders
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摘要: 采用共沉淀法制备了不同铜铁配比（质量比：45：35、50：30、55：25）的铜基预合金粉末，利用真空热压法烧结得到含金刚石的铜基结合剂刀头，通过激光焊接的方法制备出铜基结合剂金刚石锯片，研究了铜基预合金粉末中铜铁含量（质量分数）对金刚石锯片性能的影响。利用扫描电子显微镜观察锯片断面的显微组织形貌，并测量不同铜铁含量锯片的硬度和磨损量。结果表明：在三种配比中，当铜和铁质量比为50：30时，铜基结合剂与金刚石间的结合最佳，锯片性能最好，硬度最高（HRB 118），锯片的磨损量最少（1.16 g）。Abstract: The Cu-based pre-alloy powders were prepared by coprecipitation method in different ratios of Cu and Fe by mass (45:35, 50:30, 55:25), the Cu-based bonded diamond segments were fabricated by hot pressing method, and the Cu-based bonded diamond saw blades were manufactured by laser-welded method. The effects of Cu and Fe contents by mass on the properties of diamond saw blades prepared by Cu-based pre-alloyed powders were investigated. The fracture morphologies of saw blade surfaces were characterized by scanning electron microscope, and the hardness and abrasion loss of diamond saw blades were tested. The results show that, when the ratio of Cu and Fe by mass is 50:30, the combination between Cu-based bond and diamond is the optimal, the saw blades show the best performance as the maximum hardness of HRB 118 and the minimum abrasion loss of 1.16 g.
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Key words:
- Cu-based pre-alloyed powders /
- diamond saw blades /
- metal bond /
- fracture morphology /
- properties
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图 1 热压工艺制备锯片的工艺流程图
Figure 1. Process flowchart of saw blades by hot pressing sintering
图 3 三种配方锯片的断口形貌：（a）1#锯片；（b）2#锯片；（c）3#锯片
Figure 3. Fracture morphologies of saw blades: (a) 1#; (b) 2#; (c) 3#
表 1 实验用锯片配方（质量分数）
Table 1. Formula of saw blades
% 锯片编号 Cu Fe Sn Ni 1# 45 35 10 10 2# 50 30 10 10 3# 55 25 10 10 
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表 2 金刚石锯片切割性能
Table 2. Cutting performances of diamond saw blades
锯片编号 Cu: Fe质量比 切割状态 锯片失重，Δm / g 锯切面积，S / m2 1# 45:35 顺利切割 2.10 0.12 2# 50:30 顺利切割 1.16 0.12 3# 55:25 顺利切割 2.24 0.12
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