Hardness and toughness of MoSi2 and MoSi2–SiC composite prepared by reactive sintering of powders

Morris, David G.; Leboeuf, M.; Morris, M.A.

doi:10.1016/s0921-5093(98)00517-6

Cited by 58 publications

(15 citation statements)

References 22 publications

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“…The mechanical properties of composites sintered at 1300 1C and 4 1500 1C are inferior to those obtained at 1400 1C. The lower mechanical properties might be due to lower density (1300 1C) and larger grain size (4 1500 1C) of the composites and is in line with previous reports [29][30][31]. According to the Hall-Petch equation [29], the yield strength of a polycrystalline material varies inversely with the grain size.…”

Section: Resultssupporting

confidence: 87%

Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Wang

Feng

Niu

et al. 2014

Ceramics International

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Section: Resultssupporting

confidence: 87%

Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Wang

Feng

Niu

et al. 2014

Ceramics International

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“…Among the tantalum compounds, tantalum disilicide (TaSi 2 ) has a relatively low melting point of 2040°C, relatively low density of 9.14 g/cm 3 , and similar physical and mechanical properties to those of MoSi 2 23–25 . It has been proved that MoSi 2 possesses excellent oxidation resistance and high‐temperature mechanical properties 26–30 . In previous reports, MoSi 2 was successfully used as the additive to densify the poor‐sintering ceramics, such as ZrB 2 , HfB 2 , TiB 2 , and ZrC 31–34 .…”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25] It has been proved that MoSi 2 possesses excellent oxidation resistance and high-temperature mechanical properties. [26][27][28][29][30] In previous reports, MoSi 2 was successfully used as the additive to densify the poor-sintering ceramics, such as ZrB 2 , HfB 2 , TiB 2 , and ZrC. [31][32][33][34] Similarly, it is promising for TaSi 2 to densify TaC.…”

Section: Introductionmentioning

confidence: 99%

In situ Reaction Synthesis and Mechanical Properties of TaC–TaSi₂ Composites

et al. 2010

Int J Applied Ceramic Tech

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TaC–TaSi2 composites were fabricated at 1700°C by an in situ reaction/hot pressing method using Ta, Si, and graphite as initial materials. TaSi2 content was 0–100 vol%. The microstructure and mechanical properties of the composites were investigated. It was found that the relative densities of composites were above 97.5% when the volume content of TaSi2 was above 10%. The TaC/10 vol% TaSi2 composite presented the highest flexural strength of 376 MPa. When the TaSi2 content was 30–50 vol%, the composites showed the highest fracture toughness of about 4.3 MP·am1/2. In addition, the composites could retain high Young's modulus up to at least 1525°C.

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“…Its low toughness may partly result from the intrinsic difficulties of dislocation movement caused by a special C 11b crystal structure, and the brittle grain boundary of SiO 2 glass phase formed by oxygen contamination in the preparation process [3]. Meanwhile, both the mechanism of dislocation creeping and that of the grain-boundary sliding result in its lower strength at high temperature [4]. Therefore, many researches have been done to improve the mechanical properties of MoSi 2 in material design and preparing technique since the early 1970s.…”

Section: Introductionmentioning

confidence: 99%

MoSi2 oxidation resistance coatings for Mo5Si3/MoSi2 composites

Yan

Zhang

et al. 2009

Rare Metals

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In order to improve the oxidation resistance properties of 30 at.% Mo 5 Si 3 /MoSi 2 composite at high temperature in air, a molybdenum disilicide coating was prepared on its surface by a molten salt technology. XRD and SEM analysis showed that only tetragonal MoSi 2 phase existed in the coating after being siliconized for 5 h at 900°C. The oxidation film formed on the uncoated sample was not dense, so that oxygen diffused easily through it. The volatilization of MoO 3 resulted in the oxidation film separating from the substrate. The MoSi 2 coating was proved to be an effective method to prevent 30 at.% Mo 5 Si 3 /MoSi 2 composites from being oxidized at 1200°C. A dense glassy SiO 2 film was formed on the MoSi 2 coating surface, which acted as a barrier layer for the diffusion of oxygen atoms to the substrate. The 30at.% Mo 5 Si 3 /MoSi 2 composites with a MoSi 2 coating showed much better oxidation resistance at high temperature.

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Hardness and toughness of MoSi2 and MoSi2–SiC composite prepared by reactive sintering of powders

Cited by 58 publications

References 22 publications

Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

In situ Reaction Synthesis and Mechanical Properties of TaC–TaSi₂ Composites

MoSi2 oxidation resistance coatings for Mo5Si3/MoSi2 composites

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Hardness and toughness of MoSi2 and MoSi2–SiC composite prepared by reactive sintering of powders

Cited by 58 publications

References 22 publications

Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

In situ Reaction Synthesis and Mechanical Properties of TaC–TaSi2 Composites

MoSi2 oxidation resistance coatings for Mo5Si3/MoSi2 composites

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Product

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About

In situ Reaction Synthesis and Mechanical Properties of TaC–TaSi₂ Composites