Effect of surface modification on the microstructure and sintering characteristics of tungsten nanopowders prepared by a wet chemical method

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Philosophical Magazine Letters Pub Date : 2021-04-09 DOI:10.1080/09500839.2021.1910745

Xiangwei Kong, Weiqiang Hu, Zunfeng Du, T. Sun, Zongqing Ma

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引用次数: 1

Abstract

ABSTRACT In order to prepare high-performance tungsten alloys, surface modification of tungsten nanopowders prepared by a wet chemical method was carried out by acid pickling at room temperature. The low-temperature sintering characteristics of tungsten nanpowders before and after pickling was compared and analysed. The surface modification was carried out by pickling with a solution of hydrofluoric acid, concentrated nitric acid and ammonium fluoride at room temperature. After this surface treatment, uniformly distributed step-shaped defects formed on the surface of the tungsten nanopowders. After low-temperature sintering, the grain size of the tungsten alloy corresponding to the surface-modified powder precursor was reduced by 20% compared to the alloy using untreated powder as precursor. In addition, the step-shaped defects also increase the sintering activity of the pickled tungsten powder and promote its sintering densification, making the final density of pure tungsten sintered at 1600°C as high as 96.7%, and its hardness greatly increased to 521 HV0.2. The results show that room-temperature pickling and subsequent low-temperature sintering is a promising method for preparing high-performance nanotungsten alloys.

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表面改性对湿法制备纳米钨粉体微观结构和烧结性能的影响

摘要:为了制备高性能钨合金，采用室温酸洗的方法对湿化学法制备的纳米钨粉进行表面改性。比较分析了钨纳米粉酸洗前后的低温烧结特性。用氢氟酸、浓硝酸和氟化铵溶液在室温下进行表面改性。经过这种表面处理后，纳米钨粉表面形成了均匀分布的阶梯状缺陷。经低温烧结后，表面改性粉末前驱体对应的钨合金的晶粒尺寸比未改性粉末前驱体的合金减小了20%。此外，阶梯状缺陷还提高了酸洗钨粉的烧结活性，促进了其烧结致密化，使1600℃烧结纯钨的最终密度高达96.7%，硬度大幅提高至521 HV0.2。结果表明，常温酸洗后低温烧结是制备高性能纳米钨合金的一种很有前途的方法。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.