Microstructural evolution and mechanical property of WC-(Co, Fe)-ZrSiO4 hard materials consolidated by spark plasma sintering
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The widespread use of WC-based hard materials as cutting, machining, and wear-resistant materials is primarily due to theirunique combination of desirable properties such as high hardness, strength, resistance to compressive deformation. This studyinvestigates how the ZrSiO4 additive affects WC-based hard materials fabricated by a spark plasma sintering, i.e., WCZrSiO4,WC-Co-ZrSiO4, and WC-Fe-ZrSiO4. The purpose of the study is the fabrication of novel cemented carbide consistingof WC-Zircon composite that gives a clear advantage compared to conventional hard materials, i.e., WC-Co and WC-Fe, interms of cost and strengthened hardness. After being planetary ball milled to refined powder, the compact WC-X (X: metallicbinder, Co and Fe) and WC-Y (Y: Zircon, ZrSiO4) composites were consolidated at different temperatures in establishedcomposition ratios. Densification of the composites was found to depend on their microstructural evolution according towhether dissociation/transformation of zircon occurred and so inter-diffusion of binders. To investigate mechanical properties(hardness, fracture toughness, and transverse rupture strength) were measured in light of each material distribution ofadditives and grain size.
Abstract
The widespread use of WC-based hard materials as cutting, machining, and wear-resistant materials is primarily due to theirunique combination of desirable properties such as high hardness, strength, resistance to compressive deformation. This studyinvestigates how the ZrSiO4 additive affects WC-based hard materials fabricated by a spark plasma sintering, i.e., WCZrSiO4,WC-Co-ZrSiO4, and WC-Fe-ZrSiO4. The purpose of the study is the fabrication of novel cemented carbide consistingof WC-Zircon composite that gives a clear advantage compared to conventional hard materials, i.e., WC-Co and WC-Fe, interms of cost and strengthened hardness. After being planetary ball milled to refined powder, the compact WC-X (X: metallicbinder, Co and Fe) and WC-Y (Y: Zircon, ZrSiO4) composites were consolidated at different temperatures in establishedcomposition ratios. Densification of the composites was found to depend on their microstructural evolution according towhether dissociation/transformation of zircon occurred and so inter-diffusion of binders. To investigate mechanical properties(hardness, fracture toughness, and transverse rupture strength) were measured in light of each material distribution ofadditives and grain size.
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