SiC-bonded diamond material Diamond and SiC Composite

SiC-bonded diamond material  Diamond and SiC Composite

Diamond and CBN-based ceramic composites, which can be produced without high-pressure processes, are increasingly sought after for wear-resistant, durable components that enhance equipment longevity and reduce maintenance. Among them, SiC-bonded diamond materials stand out for their ability to form large, complex components through silicon infiltration of diamond preforms. The diamond content, ranging from 40–80 vol%, is determined by the preform’s green density. Infiltration can occur via gas phase or liquid silicon, with the latter ensuring strong diamond bonding within the SiC matrix.

At temperatures above 1600°C, partial graphitization occurs at the diamond-SiC interface. Thin graphite layers (100–200 nm) help maintain grain boundary strength, whereas excessive thickness or aluminum impurities weaken the composite. Wear tests confirm SiC-bonded diamond materials exhibit exceptional wear resistance, outperforming SSiC ceramics by a factor of ten, even under sandblasting conditions. The best wear resistance was observed at 1650°C, where a 77 nm graphite layer enhanced durability. Although excessive graphitization at 1670°C slightly reduced resistance, thin graphite layers did not compromise performance.

To meet the growing demand from the marine, automotive, chemical, and semiconductor industries, Diasemi has developed advanced Diamond-SiC composites, offering superior durability and wear resistance for critical applications.