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    • 86. 发明公开
    • Process for machining the surface of a nickel base superalloy workpiece
    • 一种用于治疗由基于镍超级合金的工件的表面的方法。
    • EP0049207A1
    • 1982-04-07
    • EP81630055.2
    • 1981-09-23
    • UNITED TECHNOLOGIES CORPORATION
    • Fishter, Robert EugeneLada, Henry
    • C23F1/00C09K13/04C23G1/10
    • C23F1/28
    • Disclosed is a process for machining nickel-base superalloys wherein a thermal-effect process, such as laser or electric discharge machining, is first used to remove material but leaves a recast layer. Next a chemical milling process is used wherein the etchant only attacks and removes the recast layer. The etchant is comprised by volume percent of 40-60 HN0 3 , 5-20 HCI, and 20-55 H 2 0, with which is included 0.016-0.025 moles/liter FeCl 3 and at least 0.008 moles/liter CuS0 4 . The FeCl 3 improves removal rate but tends to cause unwanted pitting and intergranular attack. These tendencies are inhibited by the addition of CuS0 4 ; preferably the molar ratio of CuS0 4 to FeCl 3 is 2:1. The beneficial combination of FeCl 3 and CuS0 4 is usable in other etchants.
    • 公开了一种用于加工镍基超合金worin热效应处理,:诸如激光或放电加工的过程中,首先用于去除材料而留下一个重铸层。 接下来,化学蚀刻工艺被用于worin蚀刻剂仅攻击和移除重铸层。 蚀刻剂是由40-60 HNO3,盐酸5-20,20-55和H 2 O的体积%组成,与所有被包括从0016到0025摩尔/升的FeCl 3和至少0.008摩尔/升硫酸铜。 该三氯化铁提高切除率,但往往引起不必要的点蚀和晶间腐蚀。 这些倾向通过加入硫酸铜的抑制; 优选硫酸铜到的FeCl 3的摩尔比为2:1。 三氯化铁和硫酸铜的有益组合在其它蚀刻剂可用。