Effect of TaB2 on densification and hardness of tantalum carbide/boride composites
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Tantalum carbides/boride composite were synthesized by spark plasma sintering (SPS), using the powder mixtures of TaC andB4C as the starting materials. In this work densification, phase formation, microstructures, and mechanical properties of thematerials were investigated. The densification of tantalum carbide (TaC) was enhanced by adding 2.0 wt% B4C, reaching 97%relative density by SPS at 1900 oC using a 30 MPa applied pressure. X-ray diffraction analysis identified two phases, TaC andtantalum diboride (TaB2), with no peak shifts, indicating a solid solubility was not significant at these temperatures. Densificationof TaC was enhanced while the grain growth was suppressed by adding 2 wt% B4C, which allowed mechanical properties to beanalyzed. Relative density of > 97% was achieved for TaC with B4C additions by SPS at 1900 oC. By comparison, additive-freeTaC could be sintered to only 76% relative density at 1900 oC. The effect of B4C addition and sintering temperature on hardnessmeasured by microhardness has been studied. Hardness of samples contain 2.0 wt% B4C was 15.10 vickers.
Abstract
Tantalum carbides/boride composite were synthesized by spark plasma sintering (SPS), using the powder mixtures of TaC andB4C as the starting materials. In this work densification, phase formation, microstructures, and mechanical properties of thematerials were investigated. The densification of tantalum carbide (TaC) was enhanced by adding 2.0 wt% B4C, reaching 97%relative density by SPS at 1900 oC using a 30 MPa applied pressure. X-ray diffraction analysis identified two phases, TaC andtantalum diboride (TaB2), with no peak shifts, indicating a solid solubility was not significant at these temperatures. Densificationof TaC was enhanced while the grain growth was suppressed by adding 2 wt% B4C, which allowed mechanical properties to beanalyzed. Relative density of > 97% was achieved for TaC with B4C additions by SPS at 1900 oC. By comparison, additive-freeTaC could be sintered to only 76% relative density at 1900 oC. The effect of B4C addition and sintering temperature on hardnessmeasured by microhardness has been studied. Hardness of samples contain 2.0 wt% B4C was 15.10 vickers.
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