科研之友
微信
新浪微博
Facebook
分享链接
摘要
The densification of tantalum carbide (TaC) was enhanced by adding 10 wt% (11 vol%) TaB2, reaching 98.6% relative density by hot pressing at 2100 degrees or 2200 degrees C using a 30 MPa applied pressure. X-ray diffraction analysis identified two phases, TaC and tantalum diboride (TaB2), with no peak shifts, indicating a solid solubility was not significant at these temperatures. Mechanical properties were measured for TaC-10 wt% (11 vol%) TaB2 hot pressed at 2100 degrees C and compared with monolithic TaC hot pressed at 2300 degrees C. The Young's modulus increased from 472 GPa for monolithic TaC to 543 GPa for TaC with 10 wt% (11 vol%) TaB2 additions. Vickers' hardness increased from 14.1 to 19.4 GPa. Fracture toughness values were comparable, in the range of 3.4-3.5 MPa.m(1/2). The average flexure strength was 600 MPa, comparable to the flexure strength of monolithic TaC (686 MPa). Thermal gravimetric analysis indicated that the TaC-10 wt% (11 vol%) TaB2 oxidized at a slightly higher temperature than monolithic TaC. Together, the results indicate that TaB2 is an effective sintering aid for the densification of TaC.
- 出版日期2008-12
