| Summary: | 碩士 === 遠東科技大學 === 機械研究所 === 97 === The produces of the compact disks were above 5 billion slices every year and accounts for 80% of output in the whole world for Taiwan, so that it ranks the first for the whole world. Among the produces of the compact disks, they were sold in Taiwan market more than 830 million. And the problem of the discarded recovery these discs will cause serious environmental impact.
The propose of this research was to destroy the metal layer on the compact disk with the electric arc and study the behavior of the layer materials on CD. The electric arc manufacture process is fast, due to a moment high temperature and high pressure, that electric arc produce.
The experimental result is as followed: When the electric arc leads and shells openly to the CD metal layer, the high kinetic energy and high temperature electrons will melt the metal piece to be splashing ball after passing through the layers. The electric arcs have reactions in the same area continuously when being destroyed and then the PC will rise with temperature to melting temperature.
The melted PC layer was pushes and formed the little hole by the high energy arc. If the reaction is continuously working, PC layer will be heated to degradation temperature continuously and form black carbon due to carbonization. The depth and width of the hole can reach 2.99μm and 21.8μm,separately. After remove the metal layer, the surface of the PC is coarse.
The metal membrane layer can be removed fast by the electric arc. When the metal liquid was cooling down, the metal solid physique is divided into a ball type and oval ball type. Its particle size distribution is about 1- 5μm.Under these experiment conditions, the maximal metal layer destroyed round diameter is 19 mm after discharge at fixed the distance between electrodes. Observed by high-speed video camera, electric arc ran from the end of positive pole to the end of negative pole. it is less than 61μsec to pass through time. Because the high energy electrons are emitted from positive pole end, then go to negative pole end by breaking through air resistance. The diameter destroyed by the end of positive pole is greater than the end of negative pole done.
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