以羰基Fe,Ni粉为原料,蜡基聚合物为粘结剂,采用粉末注射成形技术制备了4J42 Invar合金零件.研究了粉末注射成形Invar合金的脱脂及烧结工艺.结果显示:"溶剂脱脂+热脱脂"工艺能有效快速地实现粘结剂的完全脱除;经1350℃氢气烧结,可以获得致密度98.5%,30～300 ℃内平均热膨胀系数为4.5×10-6 K-1、漏气率＜1.4×10-9 Pa·m3·s-1的PIM 4J42 Invar合金.金相显微组织及XRD分析表明合金为单一稳定的奥氏体(γ相)组织.
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