Title: Co-infiltration technique of sulfur, oxygen, carbon, nitrogen and boron into the surface of high speed steel
Application Number: 85100129 Application Date: 1985.04.01
Publication Number: 1001999 Publication Date: 1986.07.30
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: C23C8/28
Applicant(s) Name: Qinghua University Address:
Inventor(s) Name: Guan Shanming, Huang Xueping, Jin Zhiyuan, Liu Cuo
Attorney & Agent: FU SHANGXIN
Abstract:
     According to this invention the high speed tools to be treated are arranged regularly in a gas-tight shaft furnace and heated to 560 deg. about 10 deg.C. On adding dropwise continually, and uniformly a liquid mixture of formamide (HCONH2), anhydrous ethyl alcohol (C2H5OH), thiourea ( (NH2)2 CS) and boric acid (H2BO4), the mixed infiltration agent decomposes on heating and liberates active atomic sulfur, oxygen, nitrogen and boron, which co-infiltrate into the surface of the tools. An infiltration layer of 0.015-0.04mm thickness can be obtained which possesses excellent anti-abrasion, anti-holding-on and red-hardness properties. The tool life can be raised I-2 fold.
Time: 5