粉末冶金新技术生产汽车喷油器压块

New Technology of Powder Metallurgy to Produce Automobile Fuel Injector Pressing Block

对汽车喷油器压块受力状态及产品结构进行分析,用粉末冶金成形、烧结新技术,成功研制出各项性能指标均达到要求的汽车喷油器压块。结果显示对于粉末冶金Fe-Ni-Mo-Cu-C合金材料,提高压坯密度可以提高产品强度但提高有限,延长烧结时间,提高烧结温度到1250℃,可以使Ni烧结基本达到均匀合金化,经碳氮共渗热处理后强度有显著提升。调整Ni和Cu的配比可以控制产品烧结尺寸变化在所要求范围,但对Fe-4Ni-Cu-0.5Mo-0.5C合金材料,Cu含量不宜超过2.5%。

The stress state and product structure of automobile fuel injector pressure block are analyzed.The automobile fuel injector pressure block with various performance indexes meeting the requirements is successfully developed by using the new technology of powder metallurgy forming and sintering.The results show that for powder metallurgy Fe-Ni-Mo-Cu-C alloy material,increasing the compact density can improve the product strength,but the improvement is limited.Prolonging the sintering time and increasing the sintering temperature to 1250℃can basically make Ni sintering achieve uniform alloying,and the strength is significantly improved after carbonitriding heat treatment.Adjusting the ratio of Ni and Cu can control the change of sintering size within the required range,but for Fe-4Ni-Cu-0.5Mo-0.5C alloy material,the Cu content should not exceed 2.5%.