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近廿年来,由于宇航、海洋开发等新领域的迅速发展,基础技术向超高温、超低温、超高压、超真空、超导电等新领域开发,对于金属材料科学提出了更高的要求,而化学热处理作为一种表面强化手段,具有很重要的地位。它具有投资少、多功能(大幅度地提高零件的机械性能与物理化学性能),并使零件表层获得高硬度、高耐磨性的同时,心部仍有较高的强韧性(相当于两种不同成份的复合材料),
In recent 20 years, due to the rapid development in new fields such as aerospace and marine development, the development of basic technologies to new fields such as ultra-high temperature, ultra-low temperature, ultra-high pressure, ultra-vacuum and superconductivity has put forward higher requirements for the science of metal materials. Heat treatment as a means of surface strengthening, has a very important position. It has less investment, multi-function (greatly improve the mechanical properties and physical and chemical properties of the parts), and the surface of the parts to obtain high hardness, high wear resistance, while the heart is still high strength and toughness (equivalent to two Different kinds of composite materials)