A novel nanostructured cemented carbide formed from WC-5%Co-20%BNi2 brazingalloy is described. During sintering, the BNi2 alloy is infiltrated into agreen compact of WC-5%Co at 1050-1100 {\deg}C for 2-60 minutes. Perfect wettingbehavior and a zero contact angle are achieved after only 40 s. Relativedensities of 98.5% and 100% and microhardness values of above 1500HV1 and1800HV1 are obtained after 2 and 30 minutes, respectively. A change in meanparticle size of about 600 nm in the precursor to a bimodal distribution of350-400 nm and 10-20 nm is explained by a solution/reprecipitation mechanism.
展开▼
