Високотемпературні відбивальні покриття для носіїв довготривалого зберігання даних

Abstract

The results of the analysis of technologies of creation and properties of high-temperature reflective coatings for long-term storage media are presented. It is shown that promising materials for such coatings are thin films based on nitrides of transition metals and platinum group metals. The particular attention is paid to physical methods of obtaining high-temperature optically homogeneous coatings. It is demonstrated that magnetron sputtering of chromium film and nitride Cr, Ti, Zr and Hf can be used as reflective coatings for optical media. To obtain a certain value of the read signal, most optical media use metal reflective coatings, the characteristics of which significantly affect the life of the media. Optical media with silver and aluminum reflective coatings, which are used on most CDs, cannot provide long-term storage of the recorded information. To create long-term data storage media that use substrates of high-stable materials (sapphire, quartz, etc.), special high-temperature reflective coatings should be used to withstand the short-term effects of elevated temperatures of the order of 1000 ° C. The analysis of scientific and technical literature showed that promising materials for heat-resistant reflective coatings are metal films of rhodium, platinum alloys, chromium, and transition metal nitrides. It is proposed to use ZrPt3 films to create high-temperature reflective coatings. The choice of this intermetallic compound to create a reflective coating is due to its high melting point (> 2190 °C). Based on ZrPt3, high-temperature and oxidation-resistant coatings have been created for carbon composites widely used in the aerospace industry. Currently, oxidation-resistant coatings are unfortunately not capable of withstanding extreme temperatures (> 2000 ° C) .Chromium films are widely used as reflective coatings. The chrome coating can effectively protect Zr tubes from high temperature oxidation in air for one hour. In such a coating, oxidation at a temperature of 1100 ° C forms an oxide layer of Cr2O3 with a thickness of 5 μm, which prevents the further penetration of oxygen into the coating. Tabl.: 1. Fig.: 2. Refs: 24 titles.