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缸套损坏的主要形式是磨损。因此,提高耐磨性就成为提高缸套使用寿命的中心任务。 目前国内配件行业生产的质量较好的硼铸铁缸套,一般使用寿命可达6000小时左右,与国际先进水平相比,仍有差距。 为了解决上述问题,农机部安排湖北第三内燃机配件厂等单位负责挤渗碳化硅缸套新工艺的研究,现已取得成功,并于1981年12月通过鉴定。 挤渗碳化硅工艺就是利用机械压力将一定粒度的碳化硅挤压嵌入缸套内孔铸铁表层,以代替高磷、硼、钒钛等合金铸铁在冷却结晶过程中产生的磷共晶、硼化物、钒钛碳氮化物等硬质相。由于碳化硅有极高的硬度（可达H V2100～3400）,因此,挤渗碳化硅缸套（简称H J T缸套）有极好的耐磨性。经大量快速磨损试验、满负荷台架试验和装机耐久使用试验证实,其耐磨性优于国内目前各种合金铸铁缸套。 一、挤渗工艺 以珩磨机为主要设备,在成品缸套上进行处理,将碳化硅与载附液搅拌均匀,加入磨头与缸套间,用磨头压力将碳化硅挤入缸套机体内。
The main form of cylinder liner damage is wear. Therefore, to improve the wear resistance has become the central task to improve the service life of cylinder liner. At present, the quality of the domestic parts industry production of boron cast iron cylinder liner, the general service life of up to 6000 hours, compared with the international advanced level, there is still a gap. In order to solve the above problems, the Ministry of Agricultural Machinery arranged Hubei Third Internal Combustion Engine Parts Factory and other units responsible for the extrusion of silicon carbide cylinder liner new technology research has been successful, and in December 1981 passed the appraisal. Extrusion infiltration silicon carbide process is the use of mechanical pressure will be a certain size of silicon carbide extrusion embedding cylinder bore hole cast iron surface to replace high phosphorus, boron, vanadium and titanium alloy cast iron in the cooling crystallization process of phosphorus eutectic, boron Compounds, vanadium titanium carbonitride and other hard phase. Due to the extremely high hardness of silicon carbide (up to H V2100 ~ 3400), the extruded silicon carbide liner (HJ T liner) has excellent wear resistance. After a large number of rapid wear test, full load bench test and durability test confirmed that its wear resistance is superior to the current domestic variety of cast iron cylinder liner. First, the infiltration process to honing machine as the main equipment, the finished cylinder liner for processing, the silicon carbide and carrier fluid mixing evenly, adding grinding head and cylinder liner, with the pressure of the grinding head squeeze into the cylinder liner .