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一前言美国Raytheon公司在1956年生产了工业规模的热解石墨制品,成功地应用于宇航工业。我国于六十年代初,开始研制热解石墨材料。我们在国内外工作的基础上,进行了热解石墨坩埚的研制和生产. 热解石墨坩埚(以下简称坩埚)不同于一般石墨坩埚。它是在高温、低压、氮气氛下,由碳氢化合物裂解后,使碳原子定向沉积在模型上,待其冷却后脱模制成. 坩埚具有良好的导热、导电性,亦具有一定的机械强度。器壁光滑、致密、渗透性很小,易清洗去污,耐高温、抗化学腐蚀性强。坩埚材料纯度高,在使用过程中,除炭素外不引入其他金属和非金属杂质。我们自1972年以来,陆续在化学、原子吸收、发
A preface Raytheon company in the United States in 1956 produced industrial-scale pyrolytic graphite products, successfully used in the aerospace industry. In the early 1960s, China started to develop pyrolytic graphite materials. Based on our work both at home and abroad, we have developed and produced pyrolytic graphite crucibles, which are different from ordinary graphite crucibles. It is in high temperature, low pressure, under nitrogen atmosphere, after cracking by hydrocarbons, the carbon atoms deposited on the model orientation, to be cooled after stripping made. Crucible has good thermal conductivity, electrical conductivity, but also has a certain degree of mechanical strength. Wall smooth, dense, little permeability, easy to clean decontamination, high temperature, strong chemical resistance. Crucible material high purity, in the process of using, in addition to carbon without the introduction of other metal and non-metallic impurities. Since 1972, we have been in chemistry, atomic absorption, hair