Effect of Induction Frequency of Chemical Liquid Vaporization Deposition on Preparation of Hydroxyapatite Coating on C/C composites

摘要

Chemical liquid vaporization deposition (CLVD) is used on C/C composites to prepare hydroxyapatite (HA) coating. The induction heating frequencies of CLVD are 450, 390, 330, and 290 kHz. The phase, morphology, and composition of the coatings are characterized by SEM, XRD, and EDS. Adhesion of the coatings onto the C/C substrates is evaluated through a scratch test. Results demonstrate that the induction heating frequencies of CLVD hardly influence the phase of HA coating. With increased induction heating frequency, the critical load increases but the density of HA coating decreases. Under extremely high frequencies, abundant defects are observed on the HA coating surfaces, and the critical load dramatically decreases. The critical load reaches the maximum (47.8 N) at 330 kHz.