钨粉机械活化对烧结Sn-Cu-Co-W材料结构和性能的影响

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING
A. Ozolin, E. Sokolov
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引用次数: 0

摘要

介绍。提高烧结材料性能的方法之一是粉末的机械活化。它保证了粉末的粉碎,改变其能量状态,加强粉末材料的烧结,并在其中形成细粒结构。钨粉在行星式离心磨机中机械活化后,可形成具有高无功功率的纳米颗粒。本文的目的是研究钨颗粒的机械活化对烧结后的Sn-Cu-Co-W粉末材料结构和性能的影响。研究技术:w16,5级钨粉在AGO-2U行星离心球磨机中机械活化5…120分钟,载体速度为400…1,000 rpm。钨、锡、铜和钴粉末的混合物在模具中通过静压压实,然后在820°C的真空中烧结。通过扫描电子显微镜、x射线显微分析和光学金相学研究了粉末颗粒的形貌和大小以及烧结样品的结构。用重量法测定了烧结试样的孔隙率。测定了烧结材料组织成分的显微硬度和宏观硬度。结果:在所研究的模式中,机械活化伴随着最小尺寸为25 nm的钨纳米颗粒的形成。除此之外,粉末暴露在冷加工中,这阻碍了进一步的铣削。具有高表面能的纳米钨粒子对Sn-Cu-Co-W粉末材料液相烧结过程中钴的溶解-沉淀有显著影响。在材料中加入纳米分散钨可以减缓烧结过程中钴颗粒的生长,并有助于形成细晶结构。烧结后的Sn-Cu-Co-W材料含有机械活化钨,其硬度达到105 ~ 107 HRB,这是由钨颗粒的冷加工和分散硬化所致。研究结果可用于改善作为金刚石磨具金属结合剂的Sn-Cu-Co-W合金的力学性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of mechanical activation of tungsten powder on the structure and properties of the sintered Sn-Cu-Co-W material
Introduction. One of the methods for improving the properties of sintered materials is mechanical activation of powders. It ensures milling the powders, changing its energy state, intensifying the sintering of powder materials, and forming a fine-grained structure in it. When tungsten powders are mechanically activated in planetary centrifugal mills, nanoparticles can be formed, which have a high reactive power. The objective of the paper is to study the effect of mechanical activation of tungsten particles on the structure and properties of the sintered Sn-Cu-Co-W powder material. Research technique: Mechanical activation of W16,5 grade tungsten powder is carried out in a planetary centrifugal ball mill AGO-2U for 5…120 minutes with carrier speeds of 400…1,000 rpm. The mixture of tungsten, tin, copper, and cobalt powders are compacted by static pressing in molds and then sintered in vacuum at 820 °C. The morphology and size of powder particles, as well as the structure of the sintered samples, are studied by scanning electronic microscopy, X-ray microanalysis, and optical metallography. Porosity of the sintered samples is identified by the gravimetric method. Microhardness of the structural constituents and macrohardness of the sintered materials are measured, too. Results: in the modes under study, mechanical activation is accompanied by the formation of tungsten nanoparticles with the minimum size of 25 nm. Alongside this, the powder is exposed to cold working, which hinders further milling. Tungsten nanoparticles, characterized by high surface energy, have a significant effect on the dissolution-precipitation of cobalt during liquid-phase sintering of Sn-Cu-Co-W powder material. Addition of nanodispersed tungsten into the material slows down the growth of cobalt particles during sintering and contributes to the formation of a fine-grained structure. The sintered Sn-Cu-Co-W material, containing mechanically activated tungsten, features higher hardness of 105…107 HRB, which is explained by cold working of tungsten particles and dispersion hardening. The results can be applied for improving mechanical properties of Sn-Cu-Co-W alloys used as metallic binders in diamond abrasive tools.
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来源期刊
Obrabotka Metallov-Metal Working and Material Science
Obrabotka Metallov-Metal Working and Material Science METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
1.10
自引率
50.00%
发文量
26
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