Research on ultrafine WC-10Co cemented carbide with high properties

Abstract

WC-10Co nanocomposite powder produced by spray pyrolysis-continuous reduction and carbonization technology was used, and the vacuum sintering plus sinterhip process was adopted to prepare ultrafine WC-Co cemented carbide. The microstructure, grain size, porosity, density, Rockwell A hardness (HRA), transverse rupture strength (TRS), saturated magnetization and coercivity force were studied. The experimental results show that average grain size of the sample prepared by vacuum sintering plus sinterhip technology was about 420 nm, transverse rupture strength was more than 3460 MPa, and Rockwell A hardness of sintered specimen was more than 92.5. Ultrafine WC-10Co cemented carbide with high strength and high hardness is obtained.

Keywords

WC-Co / nanocomposite powder / cemented carbide / vacuum sintering / sinterhip

References

[1] Allibert C H. Sintering Features of Cemented Carbides WC-Co Processed from Fine Powders[J]. Int. J. Ref. Met. Hard Mater., 2001, 19(1): 53-61.

[2] Cha S I, Hong S H, Ha G H, . Mechanical Properties of WC-10Co Cemented Carbides Sintered from, Nanocrystalline Spray Conversion Processed Powders[J]. Int. J. Ref. Met. Hard Mater., 2001, 19(4–6): 397-403.

[3] Andrén H O. Microstructure Development During Sintering and Heat-treatment of Cemented Carbides and Cermets[J]. Mater. Chem. Phys., 2001, 67(1–3): 209-213.

[4] Upadhyaya G S. Materials Science of Cemented Carbides-an Overview[J]. Mater. Des., 2001, 22(6): 483-489.

[5] Upadhyaya A, Sarathy D, Wagner G. Advances in Sintering of Hard Metals[J]. Mater. Des., 2001, 22(6): 499-506.

[6] Carroll D F. Sintering and Microstructural Development in WC/Co-based Alloys Made with Superfine WC Powder[J]. Int. J. Ref. Met. Hard Mater., 1999, 17(1–3): 123-132.

[7] Cao L H, Shi D X, Ouyang S X, . Study on Preparation of Ceramic Matrix Composite of WC-Co Ultrafine Powders [J]. J. Wuhan Univ. Tech.—Mater. Sci. Ed., 1995, 10(2): 40-46.

[8] Zhou J, Cheng J P, Mei B C, . Research on Microwave Sintering Alumina Ceramics[J]. J. Wuhan Univ. Tech.—Mater. Sci. Ed., 1998, 13(3): 34-38.

[9] Gille G, Szesny B, Dreyer K, . Submicron and Ultrafine Grained Hardmetals for Microdrills and Metal Cutting Inserts[J]. Int. J. Ref. Met. Hard Mater., 2002, 20(1): 3-22.

[10] Shao G Q, Duan X L, Xie J R, . Sintering of Nanocrystalline WC-Co Composite Powder[J]. Rev. Adv. Mater. Sci., 2003, 5(4): 281-286.

[11] Shi X L, Shao G Q, Duan X L, . Powder Extrusion Molding of Nanocrystalline WC-10. 21Co-0. 42VC/Cr₃C₂ (wt%) Composite Cemented Carbide[J]. J. Wuhan Univ. Tech.—Mater. Sci. Ed., 2006, 21(1): 46-48.

[12] Sundin S, Haglund S. A comparison Between Magnetic Properties and Grain size for WC/Co Hard Materials Containing Additives of Cr and V[J]. Int. J. Ref. Met. Hard Mater., 2000, 18(6): 297-300.

[13] Obbard E G, Lucyckx S, Thibault S H, . Determination of the Composition Range Suitable to the Formation of WC-(V,W) Cx-Co materials[J]. Int. J. Ref. Met. Hard Mater., 2001, 19(4–6): 349-357.

[14] Lay S, Thibault S H, Lackner A. Location of VC, Cr₃C₂ Codoped WC-Co Cermets by HREM and ELLS[J]. Int. J. Ref. Met. Hard Mater., 2002, 20(1): 61-69.

[15] Shi X L, Shao G Q, Duan X L, . Mechanical Properties, Phases and Microstructure of Ultrafine Hardmetals Prepared by WC-6.29Co Nanocrystalline Composite Powder[J]. Mater. Sci. Eng. A, 2005, 392(1–2): 335-339.

[16] Yamamoto T, Ikuhara Y, Sakuma T. High Resolution Transmission Electron Microscopy Study in VC-doped WC-Co Compound[J]. Sci. Technol. Adv. Mater., 2000, 1(2): 97-104.