论文部分内容阅读
本标准适用于测定金属粉末中可被氢气还原的氧含量。试样的氧含量应大于0.1％。 1 原理 1.1 将含有金属氧化物的试样,置于纯净、干燥的氢气流中加热。金属氧化物与氢反应生成的水被卡尔·菲休试剂滴定。以目视法观察吸收液颜色变化,确定测定的终点。 1.2 若因贮存和运输等过程使金属粉末吸附水份、则试样被送入石英管高温区前、应在170℃低温区内干燥,此时释出的水,称做“吸湿水含量”。注:(1)如有需要,可测定此项水含量; (2)如果需要干燥铜粉或测定铜粉中吸湿水含量时,需氮气为载气。 1.3 卡尔·菲休滴定法测水,是基于水被甲醇吸收后与由碘、二氧化硫、吡啶和甲醇配制的混
This standard applies to the determination of metal powder can be hydrogen reduction of oxygen content. The oxygen content of the sample should be greater than 0.1%. 1 Principle 1.1 The sample containing metal oxide, placed in a clean, dry hydrogen flow heating. The water produced by the reaction of the metal oxide with hydrogen is titrated with Karl Fischer reagent. Visual method to observe the color change of the absorption solution to determine the end of the determination. 1.2 If the process of storage and transportation so that the metal powder adsorption of moisture, the sample was sent to the quartz tube before the high temperature zone, should be 170 ℃ low temperature drying, the release of water, called “moisture content” . Note: (1) If necessary, determine the water content; (2) If it is necessary to dry the copper powder or determine the moisture content in the copper powder, use nitrogen as the carrier gas. 1.3 Karl Fischer titration water, based on the absorption of water by methanol and iodine, sulfur dioxide, pyridine and methanol prepared by the mixed