Study on microwave synthesis and characterisation of bulk nickel aluminides
Study on microwave synthesis and characterisation of bulk nickel aluminides
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大块铝化镍的微波合成及表征研究
DOI：
10.1179/1743284710y.0000000036
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发表时间：
2012
影响因子：
1.8
通讯作者：
Pouya Sharifi
中科院分区：
文献类型：
--
作者：
A. Karimbeigi;Alireza Zakeri;M. Aboutalebi;Pouya Sharifi
研究了在微波加热条件下，以1∶1的铝粉和镍粉为原料，燃烧合成Ni-Al金属间化合物。初步实验证实，碳化硅基座的使用可以成功地导致以快速和可再现的方式制备批量产品。的粉末混合物的压实度和应用MV功率的点火时间，以及最终产品的组成，显微组织和显微硬度的影响，进行了检查。降低压坯气孔率可使金属间化合物晶粒尺寸减小，显微硬度提高。在恒定的压实度下，MV功率的变化不影响产品的晶粒尺寸和显微硬度。但它对产物成分有明显影响;对中等致密性的样品施加1100 W的MV功率会产生NiAl，而施加440 W的MV功率会产生Al 3 Ni 2。当压制压力和MV功率都很高时，也识别出Ni 3Al沉淀物。点火时间与MV功率呈负线性关系。
Combustion synthesis of Ni–Al intermetallic compounds from 1∶1 molar mixtures of aluminium and nickel powders subjected to microwave (MV) heating has been investigated. Preliminary experiments confirmed that the usage of silicon carbide susceptor could successfully result in the preparation of bulk products in a fast and reproducible manner. The effect of the degree of compaction of the powder mixture and applied MV power on the ignition time, as well as the composition, microstructure and microhardness of the final products, was examined. Decreasing the compact porosity made the grain size of intermetallic products decrease and the microhardness increase. Variation of MV power at a constant degree of compaction did not affect the product grain size and microhardness. However, it had a distinct influence on the product composition; applying MV power of 1100 W on samples with moderate compactness resulted in NiAl, whereas that of 440 W produced Al3Ni2. Ni3Al precipitates were also identified when both the compaction pressure and the MV power were high. Moreover, a negative linear relationship was found between ignition time and MV power.