共查询到20条相似文献,搜索用时 31 毫秒
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《超硬材料工程》2019,(1)
大理石锯片普遍存在锋利度差、胎体强度低、耐用性差等问题,通过采用银基高锡预合金粉末改善大理石锯片胎体性能来解决。通过试验检测分析,银基高锡预合金粉末A烧结体组织致密,添加银元素解决了高锡预合金粉末反偏析趋势强、烧结致密度差、分散缩孔的问题;添加预合金粉A替代单质锡粉,制备的大理石锯片烧结胎体相对单质粉末体系,胎体强度提高约9%,硬度下降约14%,塑性变形能力明显增强,微观组织存在网状高银、高锡的亮色硬脆相,避免了单质锡粉偏析形成的块状硬脆相;通过切削试验证明,添加预合金粉末A的大理石锯片刀头锋利度提高,胎体对金刚石结合性能好。通过以上试验得到初步结论,银基高锡预合金粉末A可有效改善大理石锯片胎体力学性能,提高锋利度和对金刚石的把持力。 相似文献
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文章重点阐述了多元素合金(预合金)结合剂在金刚石绳锯串珠配方体系中的应用以及与单质结合剂之间的优劣对比。不同胎体结合剂对金刚石的把持力以及对金刚石的磨损度都不同,但均以粉末胎体工艺为核心,包括硬度、强度、致密度、浸润能力、磨损性及物相偏析等,同时还与多元合金的组员比例、物相结构、烧结温度、原料工艺波动等因素有关。通过相关对比试验,优质的多元素合金结合剂在烧结过程中稳定性强,烧结后组织性能好,对金刚石的浸润性及把持力较好。 相似文献
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莫松林周天盛唐兰艳郑雪莲漆细才 《超硬材料工程》2017,(3):28-30
介绍铁铜类预合金粉末应用于金刚石钻头胎体中的试验研究,通过一些基础试验验证其可行性,并经过试制钻头进行钻进试验,证明加入FeCuNi、FeCuCo类预合金粉末的钻头综合性能得到很大提高,为预合金粉末应用于钻头胎体提供了借鉴。 相似文献
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随着预合金粉末在金刚石工具中使用量的增加,使用范围的不断扩大,不断完善预合金粉末的性能,进一步满足金刚石工具应用的需求,具有重大作用与意义。在预合金粉末生产方法中:湿法冶金方法生产的预合金粉,广泛并成功地应用在国外,但成本高,在国内市场应用较少。机械合金化方法多用于科研中,批量生产能耗大。在国内主要采用气雾化、水雾化、多金属化学共沉积法等生产预合金粉末。文章探讨了氧含量对金刚石工具性能的影响;介绍了国内不同生产设备条件下的还原工艺,进一步提出不断完善预合金粉性能的各种途径,以满足金刚石工具应用的需求。 相似文献
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高活性金属铝粉在推进剂及火炸药领域具有非常重要的应用前景。综述了高活性纳米铝粉制备、纳米铝粉熔点理论及微/纳米铝粉氧化和点火燃烧性能,分析了微/纳米铝粉的应用现状,指出了纳米铝粉目前存在的瓶颈技术及解决措施,并对高活性金属铝粉的进一步应用提出了建议。 相似文献
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H.C Yang 《Powder Technology》2004,139(3):240-251
The effect of a rubber mould on densification and deformation of aluminum alloy powder was investigated during warm isostatic pressing. The hyperelastic constitutive equations based on various strain energy potentials were employed to analyze deformation of a rubber mould. The parameters in the strain energy potentials were obtained from experimental data for uniaxial and volumetric responses of Viton rubber at elevated temperatures. The yield function of Shima and Oyane was implemented into a finite element program (ABAQUS) to predict compaction responses of metal powder during warm isostatic pressing. Finite element results were compared with experimental data for densification and deformation of aluminum alloy powder during warm die pressing and warm isostatic pressing. 相似文献
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CFD modeling of primary breakup during metal powder atomization 总被引:1,自引:0,他引:1
Powder metals are the basis of powder metallurgy with a large variety of applications, including sintering and thermal spray coatings. The Gas atomization process has been widely employed as an effective method to produce fine spherical metal powders. New applications and emerging surface technologies demand high quality powders with a very narrow particle size distribution. A computational fluid dynamics (CFD) approach is developed to examine complex fluids during atomization from different nozzle designs, using the volume of fluid (VOF) method and the Reynolds Stress Model (RSM). The modeling results show that the swirling gas atomizer is not beneficial to the atomization process while the inner-jet atomizer can improve the powder generation processing. 相似文献