2.3. Diamond/metal composites
Diamond exhibits exceptionally high TC (600–2300 W/(m·K)), but the TC of diamond/metal composites has not been taken into full play [19].
2.3.1. Diamond/Cu
Diamond/Cu composites confront with two difficulties. Firstly, diamond is nonreactive with Cu and the contact angle (170°) is observed, resulting in weak interfacial bonding and high interfacial resistance. Secondly, the superficial oxidation (>700 °C) and graphitization (>1 000 °C) may take place, which have to be considered because of high manufacturing temperature [20].