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上海市地质处与勘探技术研究所从一九七七年开始进行反应烧结氮化硅工艺流程和氮化硅柱塞（取代BW250/50泵上的陶瓷柱塞）的研制工作。经过四年多的反复探索与试验，于1981年初获得成功。经上海硅酸盐研究所作力学性能测定，上海材料研究所作抗压和抗冲击强度测定，上海地质处实验室作密度测定，证明反应烧结的氮化硅材料的物理机械性能达到国内先进水平。氮化硅柱塞经江西地质研究所和北京一○一地质队生产试
The Shanghai Institute of Geology and Exploration Technology began development of a reaction sintering silicon nitride process and a silicon nitride plunger (replacement of a ceramic plunger on a BW250/50 pump) since 1977. After more than four years of repeated exploration and experimentation, it was successful in early 1981. The mechanical properties of the Shanghai Silicate Study, the Shanghai Materials Research Institute’s determination of the compressive and impact strengths, and the Shanghai Geological Laboratory’s laboratory for density testing have demonstrated that the physical and mechanical properties of the reaction-sintered silicon nitride materials have reached advanced levels in the country. The silicon nitride plunger was tested by Jiangxi Institute of Geology and the Beijing Shiyi Geological Team