论文部分内容阅读
前言所谓渗硼就是向金属材料中渗入硼,使材料表面形成非常硬的硼化合物层及硼的扩散层的方法. 根据铁——硼相图可知,在适当条件下,渗硼后,表面可得到Fe_2B+FeB或Fe_2B组织. 由于渗硼层具有很高的硬度(Hv 1200～2300),因而其耐磨性极高,远非一般表面化学热处理(如渗碳、渗氮、碳氮共渗等)所能比拟;而且还具有抗高温(850℃)氧化性和对硫酸、盐酸、磷酸、碱类等的一定耐蚀性.用铬钢渗硼还可有效地提高其疲劳强度.正是由于渗硼这一新工艺具有这样一些优点,从而日益引起了各方面的注意. 渗硼用在热锻模、冷拔模、压铸模上效果较好,尤其是对于石油、采矿工业中的高压阀门闸板、泥浆泵、深井泵的缸套等效果更好.此外,还可以普通碳钢渗硼代高合金钢.目前从国内外渗硼的实际应用情况看,
Preface The so-called boronizing is to infiltrate into the metal material boron, the material surface to form a very hard boron compound layer and boron diffusion layer method.Based on the iron - boron phase diagram shows that under appropriate conditions, after boronizing, the surface can be Get Fe 2 B + FeB or Fe 2 B. The boronizing layer has very high wear resistance due to its high hardness (Hv 1200 ~ 2300), which is far from general surface chemical heat treatment such as carburizing, nitriding, carbonitriding Etc.), but also has a high temperature (850 ℃) oxidation resistance and sulfuric acid, hydrochloric acid, phosphoric acid, alkali, etc. Corrosion resistance with boron steel chrome steel can also effectively improve its fatigue strength. As the new technology of boronizing has such advantages, it attracts more and more attentions.It is better to use boronizing in hot forging die, cold drawing die and die-casting die, especially for high pressure in petroleum and mining industry Valve gate, mud pump, deep well pump cylinder liner and other effects better.In addition, you can ordinary carbon steel boron boron high-alloy steel.At present, from the actual application of boronizing at home and abroad,