Quartz glass purity——quartz glass tube

     Quartz glass purity——quartz glass tube
     Quartz glass tubes are made from natural crystalline quartz (crystal or pure silica), or synthetic silane through high temperature melting. The processing performance after melting products is excellent, in high viscosity range, can be heat pipes and rods were processed as ordinary glass tube. The same, high-speed machining tool can also be made from diamond or SiC, which made the instrument with various complex shapes and special products. The performance of a quartz glass tube depends mainly on its purity, followed by a process or a thermal system. The existence of trace impurities will have a significant impact on the service performance of quartz glass tubes. At the same time, a slight negligence in the process or thermal system will bring various defects to the appearance, resulting in a large number of waste products.
 
     Purity is an important index of quartz glass tube, which has great influence on physical and chemical properties and performance, such as permeability and high temperature.      Strength, softening point, light transmission, heat resistance, chemical resistance, radiation resistance, fluorescence characteristics and so on; in addition, the quartz glass tube for the semiconductor industry, the purity of the more demanding, trace impurities will bring serious impact to the electrical performance and service life of semiconductor materials and integration. Because the purity requirements of semiconductor materials are controlled below ppb orders of magnitude, quartz glass tubes should be controlled at the order of PPm to meet the needs of semiconductor industry. The segregation coefficient of B is close to 1, which is difficult to remove. It is one of the harmful impurities. Cu, Fe and Ti affect the minority carrier lifetime of semiconductors. K, Na and Li are harmful impurities produced by single crystal materials.
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