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一、本发明的背景本发明所叙述的方法和装置是在负压环境下,金属通过工件吸收碳并热扩散进行渗碳,在负压环境下经济而高效地在金属工件表面形成一层渗碳层。在技术上,人们早已知道通过热扩散到工件表面中去,改变其表面化学成分,得到一层淬硬的表层。在钢表面硬化中,例如渗碳,一定有渗碳介质供应足够数量的碳,使其吸附并扩散进钢中。在本发明之前。滲碳有用盐浴的液体渗碳,用气体介质作碳源的气体渗碳和用粉末材料作碳源的粉末固渗工艺。
I. Background of the Invention The method and apparatus described in this invention are based on the negative pressure environment in which a metal absorbs carbon through a workpiece and thermally diffuses to carburize and form a layer of seepage on the surface of the metal workpiece economically and efficiently in a negative pressure environment Carbon layer. Technically, it has long been known to change the chemical composition of a surface by thermal diffusion into the surface of the workpiece, resulting in a hardened surface. In steel surface hardening, such as carburizing, there must be enough carburizing medium to supply a sufficient amount of carbon to adsorb and diffuse into the steel. Prior to the present invention. Carburizing useful salt bath liquid carburizing gas carburizing with a gaseous medium carburizing and powdered material as a carbon source powder solidifying process.