A Study Of The Influence Of Nanometer Amorphous Diamond Film On The Corrosion Resistance Of Dental Pure Ti And Co-Cr Alloys

Metal materials, including pure metal and alloy, have been widely applied in dentistry. Due to fine physical properties, they've been used as materials of dental prosthodontics, orthodontics, plombage, implantation and so on. The oral cavity is wet and contains electrolure, thus metal is likely to be corroded in such enviroment. Corrosion not only affects denture' s quality and property, more importantly, it leads to harmful biological effects. Therefore, the improvement in corrosion resistance of dental metal has great clinic significance.Surface treatment has been used commonly in recent years in the research of improving metal's corrosion resistance. Nanometer amorphous diamond film is the newest product of diamond like carbon (DLC) films. The film has high hardness , low modulus of elasticity, fine abrasion resistance and corrosion resistance and has been used on metal substrates in industry. The film can be deposited under 80℃, thus it can be used in more fields and shows great prospect of application in dentistry. Recent studies have proved that nanometer amorphous diamond film has fine biocompatibity and can bedeposited on the surface of acrylic resin to improve its abasion resistance, but we have not seen the report on the study of application of nanometer amorphous diamond film in dental metal' s surface treatment. The aim of this test is to study the influence of the nanometer amorphous diamond film on the corrosion resistance of dental pure Ti and Co-Cr alloys and explore a new way to improve corrosion resistance of dental metal.With reference to the characterization method of the diamond-like film, this research first adopted the scanning electron microscope and Raman line to characterize the structure of the deposited film on the surface of samples of pure Ti and Co-Cr alloys, so as to provide evidence for further research. Scratch test was then used to measure the bond strength between nanometer amorphous diamond film and metal substrate and at the same time compare the bond strengths with different thickensses of deposited films, so as to find the appropriate thickenss of deposited films. Finally, we used potentiodynamic polarization technique to research the influence of nanometer amorphous diamond film on the corrosion resistance of dental pure Ti and Co-Cr alloys.The main results of the study was follows:1. The deposited films on the pure Ti and Co-Cr alloys substrates are nanometer amorphous diamond film. Nanometer amorphous diamond film can be deposited on the pure Ti and Co-Cr alloys substrates.2. Nanometer amorphous diamond film can be bonded well with the dental pure Ti and Co-Cr alloys. With the same thickenss, the adhesion of nanometer amorphous diamond film on the pure Ti substrate is better than that on the Co-Cr alloys substrate. The adhesion of 50nm film on the pure Ti and Co-Cr alloys substrates is better than that of 100nm film, therefore, we should choose the appropriate thickenss of nanometer amorphous diamond film.