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高压渗氮能显著提高钛、钛合金以及难熔金属零件的硬度和耐磨性。瑞士HTM AG会长彼·豪弗说:在高压高温下,用纯氮对由钛、钛合金以及难熔金属制造的零件进行表面淬火,效果是显著的。使用类似于衡压加热装置,将零件放入该装置900～1200℃和29000 PSi的气体中处理数小时。一旦零件装入压力容器后,将其空气抽出,通入氮气,通过电加热逐渐增加压力。所需要的温度和压力持续保持1—6小时,然后逐渐减压,直至零件取出。淬火时间主要取决于温度、压力,工件金属种类和氮在工件表面的分解情况。关于工件金属种类,据豪弗说,钛,钛合金Ti—6Al—4V和大多数难熔金属与纯氮进行快速反应。他接着说,对钢和铁基合金来说是不可能的,这就是为什么HTM已停止用这种材料试验。
High-pressure nitriding can significantly improve the hardness and wear resistance of titanium, titanium alloys and refractory metal parts. Peter Hoover, president of HTM AG in Switzerland, said the surface quenching of parts made of titanium, titanium alloys and refractory metals with pure nitrogen under high pressure and high temperature is significant. Using a device similar to an equilibration heater, parts were placed in the unit at 900-1200 ° C and 29,000 PSi for several hours. Once the part has been filled into the pressure vessel, it is pumped out of the air and purged with nitrogen to gradually increase the pressure by means of electrical heating. The required temperature and pressure for 1-6 hours, and then gradually reduced pressure until the parts removed. Quenching time mainly depends on the temperature, pressure, workpiece metal species and decomposition of nitrogen in the workpiece surface. Regarding work-piece metal species, Hauff said titanium, titanium alloy Ti-6Al-4V, and most refractory metals react rapidly with pure nitrogen. He went on to say that it is impossible for steel and iron-based alloys, which is why the HTM has stopped testing with this material.