Thermal Stress Analysis of Large Area Diamond Films

The distribution of the thermal stress of large area diamond films is given by applying the actual boundary condition, and it is checked by experiments. The result is that the thermal stress of large area diamond films is not uniform, the thermal stress in the middle of large area diamond films is lager than that in the edge of large area diamond films, the press stress is the mainly part of the thermal stress. The crack of diamond films is mainly duo to the large press stress.