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CVD金刚石厚膜焊接刀具的制造及切削性能 总被引:18,自引:5,他引:18
用于制造金属切削刀具的金刚石主要有四种类型:(1)天然单晶金刚石;(2)人工合成单晶金刚石;(3)聚晶金刚石复合片(PCD);(4)化学气相沉积(CVD)金刚石膜。近年来,随着CVD金刚石工艺的发展,CVD金刚石对具的应用越来越广泛。CVD金刚石对具有两类:CVD金刚石薄膜涂层刀具和CVD金刚石厚膜焊接刀具。由于金刚石厚膜焊接刀具兼有单晶金刚石和金刚石薄膜涂层刀具的优点,从而具有广阔的应用前景。本文主要介绍金刚石厚膜的制备、厚膜刀具的制造及厚膜刀具的切削性能。 相似文献
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经对PCD和CVD金刚石厚膜显微组织的研究,发现气相沉积法生产的金刚石厚膜与PCD有着完全不同的组织形式。研制刀具并进行切削性能试验,验证了CVD金刚石厚膜刀具与PCD刀具的切削适用范围,分析了它们在机械切削加工领域中的不同使用特性。 相似文献
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通过用CVD金刚石薄膜涂层刀具切削加工SiC颗粒增强基复合材料的试验,研究了切削参数、刀具材料、刀具几何参数和工件材料对CVD金刚石薄膜涂层刀具磨损的影响规律,同时研究SiCp/Al复合材料的切削加工性能。 相似文献
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经对PCD与CVD金刚石厚膜显微组织的研究,发现气相沉积法生产的金刚石厚膜与PCD有着完全不同的组织形式。研制刀具并进行切削性能试验,验证了CVD金刚石厚膜刀具的切削适用范围,分析了它们在机械切削加工领域中的不同使用特性。 相似文献
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提高CVD金刚石薄膜刀具膜—基附着力的工艺方法评述 总被引:7,自引:2,他引:5
提高金刚石薄膜与硬质合金基底之间的附着力是CVD金刚石薄膜刀具得以推广应用的关键因素。本文介绍了国内外采用CVD法制备金刚石薄膜刀具时提高膜—基附着力的典型工艺方法 ,评述了WC Co基底预处理及沉积工艺对CVD金刚石薄膜与基底之间附着力的影响 相似文献
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Leonardo R. Silva J. Paulo Davim António Festas A. M. Abrão 《The International Journal of Advanced Manufacturing Technology》2009,41(9-10):839-845
This paper aims to study the behavior of machining forces and machined surface finish when micro-turning PA66-GF30-reinforced polyamide with various tool materials under distinct cutting conditions. The performance of polycrystalline diamond (PCD), CVD diamond coated carbide and plain cemented carbide tools (K15-KF and K15) were investigated in addition to the influence of feed rate on cutting forces, surface roughness and chip formation. The results indicated that the radial force was the highest force component because of the reduction in the effective cutting edge angle. Moreover, the cutting force increased almost linearly with feed, whereas the feed and radial forces remained unaltered. The cutting tools possessing lower edge radius promoted lower surface finish and turning forces, i.e., the best results were provided by the PCD tool, followed by the uncoated carbide inserts and finally by the CVD diamond-coated carbide tool. 相似文献
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高性能CVD金刚石薄膜涂层刀具的制备和试验研究 总被引:10,自引:0,他引:10
采用电子增强热丝EACVD法,以WC-Co硬质合金刀具为衬底制备金刚石涂层刀具,研究了提高涂层附着力的衬底预处理新方法,探讨了抑制Co催石墨化作用的有效措施,提出了改善金刚石薄膜表面粗糙度CVD后处理新工艺。研究结果表明,采用了Ar-H2微波等离子体刻蚀脱碳预处理方法对于提高金刚石薄膜涂层的附着力有明显效果,添加适量粘结促进剂,可有效地抑制CVD沉积过程中钴向表层扩散引起的催石墨化作用。采用分步沉积新工艺是减小金刚石薄膜表面粗糙度的有效方法。所制备的高附着力和低粗糙度的金刚石薄膜涂层刀具切削性能明显改善,对实现高效高精度切削加工具有十分重要的意义。 相似文献
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改善CVD金刚石薄膜涂层刀具性能的工艺研究 总被引:1,自引:0,他引:1
用热丝CVD法,以丙酮和氢气为碳源,在WC-Co硬质合金衬底上沉积金刚石薄膜,在分析了工艺条件(衬底温度、碳源浓度、反应压力)对金刚石薄膜性能的影响的基础上,提出了分步沉积法改善金刚石薄膜涂层刀具性能的新工艺.结果表明,合理控制工艺条件的新工艺对涂层薄膜质量、形貌和粗糙度、薄膜与衬底间的附着力、刀具的耐用度及切削性能有显著影响,对获取实用化的在硬质合金刀具基体上沉积高附着强度、低粗糙度金刚石薄膜的新技术具有重要的意义. 相似文献
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硬质合金表面化学镀Ni-P-金刚石粉沉积金刚石膜的研究 总被引:2,自引:0,他引:2
利用直流等离子射流装置在以化学镀Ni-P-金刚石粉为过渡层的硬质合金上沉积金刚石薄膜。采用SEM、EDS和X射线衍射仪(XRD)初步探讨了金刚石薄膜的表面形貌和物相组成。结果表明硬质合金刀片表面化学镀Ni-P后沉积金刚石薄膜,金刚石成核密度小、晶形差,难以得到结晶质量良好的金刚石膜。而在硬质合金刀片表面化学镀Ni-P-金刚石粉后沉积金刚石薄膜,成核密度比较高,晶形多为(100),但结合力较差。 相似文献
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Soumya Gangopadhyay Ranadip Acharya Ajay Kumar Chattopadhyay Vikas Gulabrao Sargade 《Machining Science and Technology》2013,17(2):208-223
In the present investigation, AA6005 (ISO: AlSiMg) alloy was machined in turning operation with different cutting tools, such as uncoated cemented carbide insert, PVD TiN coated, CVD diamond coated and PCD insert, under dry environment. Effect of cutting speed was studied for each of the cutting tools with regard to the formation of built-up layer (BUL) or built-up edge (BUE). The rake surface of the tools was characterized by optical microscopy, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopic microanalysis. Particular emphasis was given on wear mechanism of PVD TiN coated insert, conventionally used in machining ferrous alloys, during dry turning of AA6005 alloy. It has been observed that increase of cutting speed from 200 m/min to as high as 1000 m/min could not substantially reduce formation of BUL over tool rake surface during dry machining of AA6005 alloy with uncoated or PVD TiN coated cemented carbide inserts. The potential of diamond-based tools in dry machining of aluminium alloy was also studied. Finally, the effect of cutting speed on surface finish of the workpiece machined with different cutting tools was studied during dry turning of AA6005 alloy. 相似文献