微粉金刚石表面镀钛对钎焊磨具性能的影响

发布时间：2018-04-19 21:17

本文选题：电铸 + 钎焊　；参考：《中国表面工程》2017年04期

【摘要】：在微粉金刚石磨具的制备过程中,金刚石热损伤和磨粒与结合剂间界面特性是影响磨具性能的主要因素。利用电铸与钎焊相结合的工艺把表面镀钛和未镀钛两种微粉金刚石磨料制备成磨具,并将其用于氧化铝陶瓷的磨削试验。通过对钎焊后金刚石磨粒与钎料的界面分析,磨削力、磨粒脱落率以及工件表面粗糙度的比较,探讨磨粒表面镀钛对钎焊微粉金刚石磨具性能的影响。结果表明,镀钛微粉金刚石表面镀层在钎焊过程中对微粉金刚石起到包裹隔离的作用,可以降低微粉金刚石的热损伤和石墨化;在利用两种钎焊微粉金刚石磨具磨削氧化铝陶瓷时,镀钛微粉金刚石磨具的磨削力较小,磨料的脱落率也较少,且工件表面粗糙度值更低。综合比较,磨粒表面镀钛后,可以减弱微粉金刚石的热损伤,提高磨具的磨削性能。
[Abstract]:The thermal damage of diamond and the interfacial characteristics between abrasive particles and binder are the main factors that affect the properties of micro-powder diamond abrasives. Two kinds of micro-powder diamond abrasives, titanium plated and unplated, were prepared by electroforming and brazing, and used in the grinding test of alumina ceramics. The effects of titanium plating on the properties of brazed micro-powder diamond abrasives were discussed by analyzing the interface between diamond abrasive particles and solder after brazing, comparing grinding force, abrasive shedding rate and workpiece surface roughness. The results show that the coating on the surface of titanium micro-powder diamond has the function of encapsulating and isolating the fine powder diamond during brazing process, which can reduce the thermal damage and graphitization of micro-powder diamond. When two kinds of brazing micro-powder diamond abrasives are used to grinding alumina ceramics, the grinding force of titanium coated micro-powder diamond abrasives is smaller, the abrasive shedding rate is also less, and the surface roughness of workpiece is lower. Comprehensive comparison shows that the thermal damage of micro-powder diamond can be reduced and the grinding performance of grinding tool can be improved after titanium plating on the abrasive surface.
【作者单位】：华侨大学机电及自动化学院;
【基金】：国家自然科学基金(51275181)~~
【分类号】：TB306;TG74

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