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彩色显像管内的金属材料,在真空状态下高温放气性能是一项非常重要的考核技术指标。当显像管工作时,管内零件的温度升高,放出各种不同量的残余气体,成为一个慢性“放气源”,结果使管内的真空度降低,影响管子的技术性能,缩短了使用寿命。一、基本原理对于测定材料的放气量,可以采用很多种方法,例如静态法和动态法。在本实验中,用B—A规和电离规测定具有固定流导的小孔两侧压力差的办法。此法的计算公式如下:Q=u∫_0~τPdt+VP_τ式中:Q—在放气时间τ内的累积放气量(乇升/克);P_τ—放气时间为τ时的静压强(乇);V—系统的容积(升)。实际上,取放气时间为τ(大约3分钟)时,P_τ很小,可以认为上式中最后一项为零,这样便可得到:
Color picture tube of metal materials, high temperature under vacuum deflation performance is a very important assessment of technical indicators. When the tube work, the temperature of the tube parts, release a variety of residual gases, as a chronic “deflation source”, the result of the vacuum tube decreases, affecting the technical performance of the tube and shorten the service life. First, the basic principles For the determination of deflated material, you can use a variety of methods, such as static and dynamic methods. In this experiment, B-A gauge and ionization gauge were used to determine the differential pressure on both sides of the orifice with a fixed conductance. The calculation of this method is as follows: Q = u ∫_0 ~ τPdt + VP_τ In the formula: Q- in the deflation time τ cumulative deflation (Torr liter / g); P_τ- deflation time τ static pressure (Torr); V - volume of the system (liters). In fact, taking the deflation time τ (about 3 minutes), P_τ is small, we can think of the last one is zero, so you can get: