Sintered in situ MMC for Wear Protection

摘要

The aim of this study is the manufacturing of high wear resistant MMC formed in situ by two powder metallurgical routes LPS and SLPS. The first step is to compose the intended MMC by mixing the required volume fractions of powders. Crushed ferrotitanium particles FeTi with 70 mass% Ti were admixed to different metal matrix powders such as cold work tool steel, Ni-base alloy and hot work tool steel with FeBC as liquid phase donor (LPD). The next step is to choose the optimized sintering parameters and atmosphere to produce a MMC of full density with subsequent heat treatment. The sintered MMC consists of a metal matrix, precipitated hard phases and transformed FeTi with an Fe-rich core and a TiC or Ti(C,N) hard case. The finished in situ MMC were tested against abrasive paper of different type and mesh size and compared with previous MMC produced by HIP and SLPS. The application is seen in the compaction and comminution of minerals.