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针对发动机进排气门导杆采用QPQ类工艺处理的诸多弊端，在国家发明专利（89108123.2）工艺的基础上，从盐浴成分配比、活性成分、热处理参数及共渗处理层的摩擦学性能等多方面对其进行了研究。研究结果表明，适合气门导杆表面处理的TND－2工艺，即钒氮硫盐浴共渗技术，其渗层质量、摩擦学性能均优于现用于气门处理的几种工艺，且生产效率提高，污染降低。经该工艺处理的玉柴YC6105QC发动机气门顺利通过1000h可靠性试验。
Aiming at the disadvantages of using QPQ process for the intake and exhaust valve guide of the engine, based on the national invention patent (89108123.2), the tribological properties of salt bath components, active components, heat treatment parameters and co-permeation layer And many other aspects of its research. The results show that the TND-2 process suitable for the valve guide surface treatment, ie, vanadium-nitrogen-sulfur salt bath infiltration technology, the quality of the infiltration layer, the tribological performance are better than the current process used for valve treatment, and the production efficiency Improve, reduce pollution. The process of Yuchai YC6105QC engine valve passed the 1000h reliability test.