Interface bond mechanisms of ceramic-cemented carbide compact insert

Conclusion Ceramic-cemented carbide compact inserts have been developed by hot-pressing sintering techniques, the upper part of the compact insert is of Al₂O₃ + TiB₂ ceramic material, while the base part of the compact insert is of WC + Co cemented carbide. The compact insert makes full use of the advantages of the high hardness of ceramic materials and the high strength of cemented carbide, and its mechanical properties are just between that of Al₂O₃ + TiB₂ and WC + Co. SEM, XRD and electron microprobe analysis showed that element diffusion and formation of new phases are the main causes for the bond of Al₂O₃ + TiB₂ with WC + Co in the interface.     

短柄泥蜂属一新种记述(膜翅目:泥蜂总科:短柄泥蜂科)

本文记述了泥蜂总科Sphecoidea短柄泥蜂科Pemphredonidae短柄泥蜂属Pemphredon Latreille一新种:赵氏短柄泥蜂Pemphredon chaoi Li et He,sp. nov. 模式标本保存在中国科学院动物研究所。