Study on Reduction of MoO2 Powders with CO to Produce Mo2C

Dang, Jie; Zhang, Guohua; Wang, Lu; Chou, Kuo‐Chih; Pistorius, Petrus Christiaan

doi:10.1111/jace.14042

Cited by 23 publications

(10 citation statements)

References 24 publications

(35 reference statements)

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“…10) Because of its high hardness, high melting point, and wear resistance, Mo 2 C has been widely applied as a reinforcement material in in steel and in metal ceramics. 11,12) It is worth mentioning that Mo 2 C is also an effective grain growth inhibitor due to its high solubility and mobility in the metal matrix phase. 13) Our previous studies indicated that heat treatment can be used to increase the strength and hardness of as-sintered P/M alloy steel.…”

Section: Mechanical Properties and Microstructures Of Mo 2 C Strengthmentioning

confidence: 99%

Mechanical Properties and Microstructures of Mo2C Strengthened Vanadis 4 Extra Alloy Steel by Powder Metallurgy and Heat Treatments

Chang

Chuang

Huang³

2019

ISIJ Int.

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In this work, different ratios of molybdenum carbide (1, 3 and 5 mass% Mo 2 C) powders were added to Vanadis 4 extra alloy steel powders and then mixed by ball milling for 6 h. The composite powders underwent vacuum sintering at 1 200, 1 220, 1 240, 1 260 and 1 280°C for 1 h, respectively. The results showed that the optimal sintering temperature for the addition of 5 mass% Mo 2 C powders was 1 220°C. It also represented that the apparent porosity was 0.18%, and that a transverse rupture strength (TRS) value of 2 281.3 MPa and a hardness value of 79.2 HRA were obtained, respectively. Additionally, the TRS value was obviously enhanced to 2 437.6 and 2 491.4 MPa by the addition of 5 mass% Mo 2 C powders after heat treatment and sub-zero plus heat treatments, respectively. Meanwhile, the hardness value also increased to 80.6 and 81.3 HRA, respectively, whereas the Mo-rich M 6 C carbides distributed in the grain boundaries, and V-rich MC carbides appeared in the grain and grain boundaries after sub-zero plus heat treatments. Significantly, a series of heat treatment processes is effective in improving the microstructure and strengthening the mechanical properties of the sintered Vanadis 4 extra composites.

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Section: Mechanical Properties and Microstructures Of Mo 2 C Strengthmentioning

confidence: 99%

Mechanical Properties and Microstructures of Mo2C Strengthened Vanadis 4 Extra Alloy Steel by Powder Metallurgy and Heat Treatments

Chang

Chuang

Huang³

2019

ISIJ Int.

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“… 40 To circumvent this issue, our study involves the prior synthesis of the Mo carbide by contacting the Mo/HZSM-5 pre-catalyst with carbon monoxide (CO) at a high temperature (780 °C). Indeed, carbon monoxide has been reported to carburize Mo oxides to Mo 2 C. 41 – 43 We will demonstrate by a combination of online mass spectrometry (MS) and operando X-ray absorption spectroscopy that the Mo (oxy-)carbide produced via CO carburization and CH 4 activation is equivalent. We report more direct structural characterization of the active site using 13 C NMR.…”

Section: Introductionmentioning

confidence: 99%

On the dynamic nature of Mo sites for methane dehydroaromatization

et al. 2018

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“…it has been widely applied as a reinforcement 1 material in metal ceramics [15,16]. Moreover, Mo 2 C is also the most effective grain growth inhibitor due to its excellent solubility and mobility in the metal matrix phase during the liquid phase sintering (LPS) of the PM process [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Microstructure and Strengthening Mechanisms of Mo2C Powders Being Added to Ti-8Nb-4Co Alloy Via the Vacuum Sintering Process

Chang,

Liao,

Huang

et al. 2023

Archives of Metallurgy and Materials

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EffEcts of thEMicrostructurE and strEngthEning MEchanisMs of Mo 2 c PowdErs BEing addEd to ti-8nb-4co alloy Via thE VacuuM sintEring ProcEssThis study utilizes Ti-8nb-4Co alloys added to different proportions of Mo 2 C powders (1, 3, and 5 mass%) by the vacuum sintering process of powder metallurgy and simultaneously vacuum sinters the alloys at 1240, 1270, 1300, and 1330°C for 1 h, respectively. The experimental results indicate that when 3 mass% Mo 2 C powders were added to the Ti-8nb-4Co alloys, the specimens possessed the optimal mechanical properties after sintering at 1300°C for 1 h. The relative density was 98.02%, and the hardness and TRS were enhanced to 69.6 hRa and 1816.7 MPa, respectively. in addition, the microstructure of vacuum sintered Ti-8nb-4Co-3Mo 2 C alloys has both α and β-phase structures, as well as TiC precipitates. EBSD results confirm that the Mo 2 C in situ produced TiC during the sintering process and was uniformly dispersed in the grain boundary. Moreover, the reduced molybdenum atom acted as a β-phase stabilizing element and solid-solution in the titanium matrix.

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Study on Reduction of MoO₂ Powders with CO to Produce Mo₂C

Cited by 23 publications

References 24 publications

Mechanical Properties and Microstructures of Mo<sub>2</sub>C Strengthened Vanadis 4 Extra Alloy Steel by Powder Metallurgy and Heat Treatments

Mechanical Properties and Microstructures of Mo<sub>2</sub>C Strengthened Vanadis 4 Extra Alloy Steel by Powder Metallurgy and Heat Treatments

On the dynamic nature of Mo sites for methane dehydroaromatization

Effects of the Microstructure and Strengthening Mechanisms of Mo2C Powders Being Added to Ti-8Nb-4Co Alloy Via the Vacuum Sintering Process

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