摘要
通过热力学分析和计算及电子显微镜观察．发现了硬质合金中存在着堆垛间隙和堆垛孔隙，这是不可抗拒的趋势。通过非均质形核理论．发现了硬质含金中有限量Co相情况下．Co相发生皱缩现象．其特征是点状、链状及块状皱缩．另外WC－Fe、WC－Ni、WC一Co、W－Cu合金也有类似的不可抗拒的皱缩现象。这种由皱缩产生的极微细间隙则是实测强度远远低于理论计算强度的成因。通过电镜观察发现了非均质形核中点阵匹配理论的例证，证实了WC与Co结合是Co立方晶系。硬质合金中溶解析出发生的场所基本上是原址不动；合金中的Co相与WC不可能均质的混匀，不可避免地会发生钴池和晶界熔合。从而论证了硬质合金随机堆垛结构理论是正确的。
The author discovered by the thermodynamic an1ysis,the thermodynamic calculation and the electron microscope obser-vation,that the stacking pores and the stacking interva1s existed in the hatdmetal,that the Co phase occurred wrinkly shrink-age under finite quantity Co phase circumstances,their features were the point,the chain and the slice-wrinkly shrinkages,besides WC-Fe, WC-Ni, WC-Cu, W-Cu alloys had a1so like wrink1y shrinkage. These were the irresistible tendency.The very minute interval by the wrinkly skrinkage .led the actual intensity more low than the theoretical intensity. The au-thor found also instance vestiges of the crystal lattice match theory for the heterogeneous nucleation. This proved the con-jugation of the WC and Co phase as a result of the Co cubic lattice. The solution and reprecipitation location situated funda-mental in the original place. The WC and Co phases of WC-Co hardmetals cannot homogene0usly mixed,therefore the Copool and the intercrysta1line interfusion occurred unavoidab1y. Thus ,'the random stacking structure'theory has been demon-stratad only correct..
出处
《硬质合金》
CAS
1999年第4期193-200,共8页
Cemented Carbides
关键词
硬质合金
润湿
堆垛孔隙
堆垛间隙
皱缩
stacking pore and stacking interval
wrinkly shrinkage
high class wetting
heterogeneous nucleation
intercrys-talline inerfusion
