Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1975-02-27
1977-01-04
Hunt, Brooks H.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291828, 75201, 75202, 75204, C22C 2900
Patent
active
040009807
ABSTRACT:
An abrasion-resistant sliding material is produced by forming a powdery mixture of (a) 70-98% of a eutectic alloy consisting of 0.2-3.0% of boron, 1.0-4.0% of carbon, with the balance being iron, the alloy having a particle size finer than 200 mesh and (b) 2-30% of a second eutectic alloy consisting of 3.0-7.0% phosphorus, 0.5-2.5% of carbon, with the balance being iron, this second alloy also having a particle size finer than 200 mesh, compression molding the resulting mixture into a desired shape at a pressure of 0.5-3.0 t/cm.sup.2, and sintering the resulting molded product at 950.degree.-1130.degree. C. for at least 5 minutes in an atmosphere of an inert gas (e.g., argon, nitrogen, hydrogen) or in a vacuum. The final product is characterized in that it has a porosity not exceeding 7.0%, a pore size not exceeding 50.mu. in diameter, with its structure including portions of iron compounds [Fe.sub.3 (B.C.)], portions where iron and iron compounds are copresent [Fe + Fe.sub.3 (B.P.C.)] and in which the P content is higher at the boundary areas than at the central areas, and portions of fine pores.
REFERENCES:
patent: 2213523 (1940-09-01), Jones
patent: 2226520 (1940-12-01), Lenel
Jones, Fundamental Principles of Powder Metallurgy 1960, 695 Jb pp.863-867.
Morishita Tsuyoshi
Yamada Toshio
Hunt Brooks H.
Toyo Kogyo Co. Ltd.
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