Sintering behaviour of Nb-16Si-25Ti-8Hf-2Cr-2Al alloy powder fabricated by a hydrogenation-dehydrogenation method

被引：3

作者：

Park, Ki Beom ^{[1
]}

Choi, Jaeho ^{[2
]}

Lee, Sung Yong ^{[1
]}

Park, Jae-Young ^{[1
]}

Na, Tae-Wook ^{[1
]}

Choi, Jong-In ^{[1
]}

Kang, Jang-Won ^{[1
]}

Park, Hyung-Ki ^{[1
]}

机构：

[1] Korea Inst Ind Technol, Funct Mat & Components R&D Grp, Gangwon Div, Kangnung 25440, South Korea

[2] Gangneung Wonju Natl Univ, Dept Adv Met & Mat Engn, Kangnung, South Korea

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2020年 / 36卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

Nb– 16Si– 25Ti– 8Hf– 2Cr– 2Al alloy; Nb silicide-based alloy; hydrogenation– dehydrogenation; sintering; powder metallurgy; IN-SITU COMPOSITES; MECHANICAL-PROPERTIES; TEMPERATURE; MICROSTRUCTURES; COATINGS; STRENGTH;

D O I：

10.1080/02670836.2020.1783485

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study investigated the sintering behaviour of Nb-16Si-25Ti-8Hf-2Cr-2Al alloy powders. The alloy powders were produced using ahydrogenation-dehydrogenation method and featured an irregular morphology. Powders sintered at 1500 degrees C and 1600 degrees C exhibited pores in their microstructures, while powders sintered at 1700 degrees C for 4 h were fully densified and poreless. The cast ingot and powders were composed of three phases: Nb-ss, Nb5Si3, and Nb3Si. However, the Nb3Si phase was not observed, while HfO2 oxides formed in the sintered compact. The hafnium and oxygen reacted to form an HfO2 oxide during the high-temperature sintering process. From the result of the thermodynamic calculation, Hf oxide formed after sintering because Hf has the highest driving force for oxidation among the elements constituting the alloy.

引用

页码：1372 / 1380

页数：9

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