共查询到19条相似文献,搜索用时 187 毫秒
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金刚石微粉性能是提升金刚石线锯性能的关键因素。用化学镀方法在线锯用金刚石微粉表面镀镍,通过正交试验研究金刚石粒度、次亚磷酸钠浓度、镀液pH值和镀液温度对化学镀镀层沉积速率、镀层密度、镀层耐腐蚀性能、镀层致密度等性能的影响。结果表明:M1/2、M6/12、M20/30三种不同粒度金刚石微粉,在次亚磷酸钠浓度为25~35g/L、化学镀液pH值为3~11、化学镀温度为30℃~90℃时,针对镀层沉积速率、镀层密度和镀层耐腐蚀性的最佳工艺参数不同;不同粒度的金刚石微粉在相同工艺条件下化学镀镍,金刚石微粉粒度越大,镀层越均匀致密;金刚石微粉化学镀镍各工艺参数之间相互作用,共同影响镀层性能。对于不同粒度的金刚石微粉,各因素对镀层性能的影响权重不同,因此针对不同粒度、不同镀层性能需求的金刚石微粉应采取不同的镀覆工艺参数。 相似文献
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<正> 镍磷合金镀层具有优异的抗蚀性和耐磨性,在工业上已得到一定程度的应用,尤其是在工模具上显示了它的优越性。工模具镍磷合金化学镀复热处理,是依靠次亚磷酸盐的强还原能力,把零件浸入镍盐和次亚磷酸盐为主要成份的盐浴中,由于化学还原的作用,使镍磷镀复在工件表面上,厚度为10~30μm;然后经200~400℃回火(或时效) 相似文献
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Ni-P-Al_2O_3双层化学复合镀的工艺及性能 总被引:3,自引:0,他引:3
】介绍了在钢铁表面施镀Ni-P-Al2O3化学复合镀前先进行Ni-P化学镀的工艺及施镀后的双层化学镀层的组织与性能。结果表明,双层复合镀层比单层复合镀层具有更好的结合强度和耐磨性,耐蚀性也得到改善 相似文献
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本文研究了Ni—P化学镀主盐含量比(次亚磷酸钠/硫酸镍)、pH值及镀液老化等因素对Ni—P化学镀沉积速度V_p、镀层磷含量的的影响规律,分析了镀液老化的实质。 相似文献
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研究了介质中NaOH浓度、镀层Cr2O3含量及热处理条件对低磷N i-P-Cr2O3化学复合镀层耐磨蚀性的影响,并与N i-P化学镀层进行了对比。结果表明:镀层的耐磨蚀性与介质中NaOH浓度呈线性关系,在任何NaOH浓度下复合镀层的耐磨蚀性均优于N i-P镀层;镀层Cr2O3质量分数在8%左右耐磨蚀性达到最佳值;经适当的热处理可显著提升镀层的耐磨蚀性。 相似文献
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An investigation is reported of an analysis on the thermally induced sawblade wear in circular sawing of granites with diamond segmented tools. The temperatures at the diamond–workpiece interface were measured in dry sawing using a foil thermocouple in order to examine the contribution of temperatures to the wear of the segments. Scanning electron microscope and energy dispersive spectrometers were employed to analyze the mechanisms for the bonding of Ti/Cr-coated diamonds to an iron-based matrix. Over 90% of the consumed energy was found to conduct into the diamond segments as heat in the sawing. Strong metallurgical bonding was observed at the diamond–matrix interface and subsequently the retention ability of the matrix to diamonds was increased. However, the retention effect of the coating was greatly offset by the disparity of diamond crystal strength, which could be improved by multistage shape selecting and magnetic separating. Coupled with the mechanisms for thermal wear, attempts were made to reduce thermally induced wear by using Ti/Cr-coated diamonds, reducing the disparity of diamond crystal strength, designing unique structured segments and selecting optimal machining parameters. 相似文献
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对电镀金刚石丝锥的加工工艺进行了研究,给出了电镀金刚石丝锥的制造过程,主要包括镀液的配制、金刚石的清洗、上砂槽的制作、试件的镀前处理、预镀、上砂、增厚处理等。通过大量的实验研究和数据分析,重点讨论了电镀工艺参数、主盐浓度对镀层硬度和沉积速度的影响。 相似文献
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Ni-P-Cr2O3化学复合镀层耐磨性的研究 总被引:2,自引:0,他引:2
研究了热处理对Ni-P-Cr2O3化学复合镀层组织结构、硬度及耐磨性的影响,并与Ni-P镀层作了对比。结果表明,镀层的摩损规律与硬度变化规律不同,采用正确的热处理工艺,可使镀层的硬度及耐磨性显著改善。 相似文献
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Wear of monocrystalline diamond tools during ultraprecision machining of nonferrous metals 总被引:1,自引:0,他引:1
In studying the wear behavior of diamond cutting tools, a pragmatic appraoch has been chosen in which the tool wear and the change in cutting forces have been specifically determined as a function of tool life. Several nonferrous metals, such as copper, aluminium, and electroless nickel, have been machined. The influence of microstructural characteristics, crystallographic orientation, and mechanical surface state of diamonds on tool-wear behavior is investigated in considerable detail. It has been found that wear behavior of diamond tools depends strongly on workpiece material, so that when machining aluminium, all types of diamond show considerable and almost the same degree of wear. However, machining copper and electroless nickel entails much subtler wear characteristics; in fact, great differences in wear resistance between different types of diamonds were discerned. Type all diamonds in particular, both synthetic and natural, appear to be highly resistant to wear. The best crystallographic orientation for wear-resistant diamonds depends on the way the cutting tools are used. 相似文献