Evaluation of Aluminium Nitride Powder Surfaces for High Thermal Conductive AlN Ceramics by Temperature Programmed Desorption (TPD)

摘要

The thermal conductivity of AlN ceramics is strongly dependent on the chemical state of raw powder surfaces. Controlling the surface quality of raw powders is important, and the powder surface characteristics must be studied. Unfortunately, it is not possible to obtain information on the surface characteristics which may influence the sinterability and thermal conductivity of the products by conventional chemical analytical methods. In this work, temperature programmed desorption (TPD) is used to investigate the powder surfaces of three types of AlN powders. Interesting results are obtained by deconvolution of the TPD spectra to characterize the surfaces of three commercial AlN powders.