IN-SITU SYNTHESIS OF WC-CO COMPOSITE IN WO3- CO3O4- C SYSTEM BY CARBOTHERMIC REDUCTION METHOD

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AMIRI MOGHADDAM A.; KALANTAR M.

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Journal: ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL) Year:2017 | Volume:36 | Issue:1 Page(s): 121-130

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Title

IN-SITU SYNTHESIS OF WC-CO COMPOSITE IN WO3- CO3O4- C SYSTEM BY CARBOTHERMIC REDUCTION METHOD

Author(s)

AMIRI MOGHADDAM A. | KALANTAR M. | Issue Writer Certificate

Keywords

IN-SITU CARBOTHERMIC REDUCTIONQ2

WC-CO CERMETQ2

X-RAY DIFFRACTIONQ2

DIFFERENTIAL THERMAL ANALYSISQ2

THERMAL GRAVIMETRIC ANALYSISQ2

PHASE ANALYZEQ2

MECHANICAL AND PHYSICAL PROPERTIESQ2

Abstract

The aim of this investigation is obtaining WC-Co composite powder from WO3 and Co3O4 by in-situ and carbothermic reduction method using activated carbon as a reducing agent. In this study, cobalt and tungsten oxide powders with 17% carbon (30% more than stoichiometric value) were mixed by ball-milling under atmosphere of argon for 20 hours. DIFFERENTIAL THERMAL ANALYSIS (DTA) and Thermal Gravimetric Analysis (TGA) results on powder mixture show complete reducing of oxides at 1050oC and forming cobalt carbide and tungsten carbide. Compact samples underwent carbothermic reduction at 1050oC for different times of 1, 2 and 4 hours with protective layer of alumina and carbon powder mixture with ratio of 1: 1. Based on X-RAY DIFFRACTION (XRD) analyses, the best holding time in furnace is 4 hours, in which tungsten reduction and carbonization is completed. XRD evaluation of reduced compacted samples in three conditions of atmosphere protective layer of alumina and carbon powder mixture with ratio of 1: 1, protective foil of refractory steel and argon, shows that unreduced oxides and extra phases are present in argon atmosphere and protective foil of steel but not in alumina and carbon mixture layer. The measurement results of physical and mechanical properties on the sintered composite sample in heating rate of 5oC /min to temperature 1500oC and the holding time of 2 hours under a shielding layer of alumina and carbon shows obtaining the optimal properties (Pr=80%, KIC=8.1 MPa, MHV=15.67GPa) comparable to that of advanced and costly methods.

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APA: Copy

AMIRI MOGHADDAM, A., & KALANTAR, M.. (2017). IN-SITU SYNTHESIS OF WC-CO COMPOSITE IN WO₃- CO₃O₄- C SYSTEM BY CARBOTHERMIC REDUCTION METHOD. ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL), 36(1 ), 121-130. SID. https://sid.ir/paper/163283/en

Vancouver: Copy

AMIRI MOGHADDAM A., KALANTAR M.. IN-SITU SYNTHESIS OF WC-CO COMPOSITE IN WO₃- CO₃O₄- C SYSTEM BY CARBOTHERMIC REDUCTION METHOD. ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL)[Internet]. 2017;36(1 ):121-130. Available from: https://sid.ir/paper/163283/en

IEEE: Copy

A. AMIRI MOGHADDAM, and M. KALANTAR, “IN-SITU SYNTHESIS OF WC-CO COMPOSITE IN WO₃- CO₃O₄- C SYSTEM BY CARBOTHERMIC REDUCTION METHOD,” ADVANCED MATERIALS IN ENGINEERING (ESTEGHLAL), vol. 36, no. 1 , pp. 121–130, 2017, [Online]. Available: https://sid.ir/paper/163283/en

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