Densification and grain growth kinetics of boron carbide powder during ultrahigh temperature spark plasma sintering

MeiZHANG,Wen-junWANG,Tie-chuiYUAN,Si-yaoXIE,Rui-diLI,Zhi-huiZHOU,Yun-baoXU

doi:10.1016/S1003-6326(22)65921-1

Transactions of Nonferrous Metals Society of China >

2022 , Vol. 32 >Issue 6: 1948 - 1960

DOI: https://doi.org/10.1016/S1003-6326(22)65921-1

Materials Science and Engineering

Densification and grain growth kinetics of boron carbide powder during ultrahigh temperature spark plasma sintering

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Mei ZHANG¹, Wen-jun WANG^1,2, Tie-chui YUAN¹, Si-yao XIE³, Rui-di LI¹, Zhi-hui ZHOU¹, Yun-bao XU⁴

1. Science and Technology on High Strength Structural Materials Laboratory, State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Zhejiang Libo Industrial Co., Ltd., Shaoxing 312000, China;
3. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
4. Hunan Institute of Engineering, Xiangtan 411100, China

Online published: 2022-06-25

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Abstract

Dense B₄C material was fabricated using spark plasma sintering (SPS), and the densification mechanisms and grain growth kinetics were revealed. The density, hardness, transverse flexure strength and toughness of samples were investigated and the model predictions were confirmed by SEM and TEM experimental observations. Results show that SPSed B₄C exhibits two sintering periods: a densification period (1800-2000 °C) and a grain growth period (2100-2200 °C). Based on steady-state creep model, densification proceeds by grain boundary sliding and then dislocation-climb-controlled mechanism. Grain growth mechanism is controlled by grain boundary diffusion at 2100 °C, and then governed by volume or liquid-phase diffusion at 2200 °C.

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MeiZHANG,Wen-junWANG,Tie-chuiYUAN,Si-yaoXIE,Rui-diLI,Zhi-huiZHOU,Yun-baoXU . Densification and grain growth kinetics of boron carbide powder during ultrahigh temperature spark plasma sintering[J]. Transactions of Nonferrous Metals Society of China, 2022 , 32(6) : 1948 -1960 . DOI: 10.1016/S1003-6326(22)65921-1

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