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预燃室喷咀是大马力高速柴油机燃烧系统的一个关键零件。它承受较高的热负荷和剧烈的温度交变,同时还受到高温高速燃气的腐蚀和冲刷,该零件在使用过程中经常发生断裂,是内燃机车柴油机重大技术关键问题之一。东方红<5>型内燃机车柴油机过去使用铁基合金Cr_(20)Ni_(14)Si_2喷咀,经常发生断裂,使用寿命仅为几百小时至二千小时;东方红<3>型内燃机车柴油机采用组装式精铸钻基合金FSX-414喷咀,使用中几乎全部松动,甚至脱落,必须与预燃室体进行四点焊接后方能使用,摩擦焊钴基合金FSX-414喷咀的寿命也仅6,000小时左右。
The pre-chamber nozzle is a key part of high-horsepower high-speed diesel combustion systems. It withstands high heat load and violent temperature changes, but also by the high temperature and high speed gas corrosion and erosion, the parts often break during use, is one of the major technical issues of diesel locomotive diesel engine technology. In the past, Diesel engines of Dongfang Hong <5> diesel locomotive often used Cr_ (20) Ni_ (14) Si_2 nozzle with iron-based alloy and ruptured frequently, and the service life was only several hundred hours to two thousand hours. The Dongfanghong <3> diesel engine Diesel engine using the assembly type casting base alloy FSX-414 nozzle, the use of almost all loose, or even off, must be pre-combustion chamber after four-point welding before use, friction welding of cobalt-based alloy FSX-414 nozzle life It’s only about 6,000 hours.