BrX铬青铜粉的相组成和结构

B. Vintaikin, A. Smirnov, S. Shevchenko, A. A. Drenin, V. I. Sheykina
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引用次数: 0

摘要

通过x射线相分析、光学和扫描电子显微镜的方法,以及构建化学元素氧和铜的分布图,证实了PR-BrX牌青铜粉末的结构中存在含氧相的FСС晶格,即沿晶界和粉末颗粒表面存在氧化铜(CuO, Cu2O)。利用这些方法证明,在450℃的氨水中退火可以促进氧化相还原为初始固溶体的单相结构。结果表明,氧化后的粉末颗粒表面和颗粒内部存在氧化物,不适合用于选择性激光熔化工艺。这是由于氧化物的减少,因此,在激光3D打印过程中,物体的排气和过度孔隙率。结果表明,在氨水中还原退火形成了以FCC铜为基础的单相粉末颗粒结构,这使得使用各种激光加工方式生长气孔率不超过2.5%的小物体成为可能
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Phase Composition and Structure of the BrX Chromium Bronze Powder
Methods of the X-ray phase analysis, as well as optical and scanning electron microscopy supplemented by construction of the distribution maps for such chemical elements as oxygen and copper demonstrated presence in the structure of the PR-BrX brand powder made of bronze with the FСС lattice of oxygen-containing phases, i.e., copper oxides (CuO, Cu2O) located along the grain boundaries and on the powder particle surface. Using these methods demonstrated that annealing in the ammonia at a temperature of 450 °C promoted reduction of the oxide phases to the single-phase structure of the initial solid solution. It was found out that the presence of oxides on the powder particles surface and grain boundaries inside these particles made the oxidized powder unsuitable for use in the selective laser melting technology. This is due to reduction of the oxides, and, consequently, to the outgassing and excessive porosity of objects during the laser 3D printing. It was proved that reductive annealing in ammonia formed a single-phase structure of powder particles based on the FCC copper, which made it possible to grow objects with small porosity not exceeding 2.5 % using various laser processing modes
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来源期刊
CiteScore
1.10
自引率
0.00%
发文量
40
期刊介绍: The journal is aimed at publishing most significant results of fundamental and applied studies and developments performed at research and industrial institutions in the following trends (ASJC code): 2600 Mathematics 2200 Engineering 3100 Physics and Astronomy 1600 Chemistry 1700 Computer Science.
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