Rapid synthesis of highly pure Nb2AlC using the spark plasma sintering technique

被引：19

作者：

Zhou, Weibing ^{[1
]}

Li, Kang ^{[1
]}

Zhu, Jiaoqun ^{[1
,2
]}

Tian, Shouqin ^{[2
]}

机构：

[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China

[2] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2018年 / 120卷

关键词：

Sintering; MAX; Nb2AlC; SPS; TEMPERATURE COMBUSTION SYNTHESIS; TERNARY CARBIDE TI3SIC2; MECHANICAL-PROPERTIES; HIGH-PURITY; POLYCRYSTALLINE TI2ALC; M(N+1)AX(N) PHASES; CERAMICS; TI3ALC2; DENSIFICATION; FABRICATION;

D O I：

10.1016/j.jpcs.2018.04.029

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this work, highly pure Nb2AlC was successfully synthesized using the spark plasma sintering (SPS) technique with Nb, NbC and black carbon as raw materials at 1450 degrees C and 30 MPa for 8 min. The obtained Nb2AlC grain shows a characteristic layered structure. More interestingly, the obtained Nb2AlC exhibits good electrical, thermal and mechanical properties. The coefficient of thermal expansion is 9.0 x 10(-6) K-1 from room temperature to 1200 degrees C. The electrical conductivity reaches 1.3 x 10(6) S m(-1) at 500 degrees C, indicating excellent high-temperature conductivity. The Vickers hardness and flexural strength are 4.0 GPa and 440 +/- 10 MPa, respectively. Importantly, fracture toughness of the obtained Nb2AlC material reaches 7.8 +/- 0.2 MPa m(1/2), which is higher than that of other previously studied MAX materials. Therefore, SPS is a very effective method to fabricate Nb2AlC materials and can also be used to prepare other MAX materials.

引用

页码：218 / 222

页数：5

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