催化剂还原后怎么绝氧转移到水中?有个方法你可以试试。不一定可行。主要还是催化剂的量不好控制，另外还原温度和高温分解的东西都是个问题。先把待还原的催化剂和溶剂一起投到反应釜，之后通氢气在既定温度按照程序还原，之后拆掉再投反应，因为溶剂的保护就可以绝氧效果肯定要好点。[ last edited by yaw1101 on 2010-9-15 at 23:22 ]查看更多
焊接中一个问题？ fyi 120目标准磨光除非另有说明 the term, "grit" refers to "the size of the abrasive particle or the mesh number. this is the number of holes per linear inch in a sieve" (stafford, 1980). some find this hard to believe. consider some 320-grit abrasive paper. the abrasive particles were passed through a screen that had 320 wires per linear inch, not per square inch. in a square inch there would be 320 x 320 openings, or 102,400 openings in this wire mesh. larger grit numbers indicate "finer" abrasive sizes, and smaller numbers indicate "coarser" sizes. most abrasives work by wearing away the substrate. they produce scratches in it. typically, successively finer abrasives are used, with each one replacing the larger scratches of the previous abrasive with smaller scratches.查看更多
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