Internal combustion engine tappet comprising a sintered powdered metal wear resistant composition

Patent · Tue Oct 28 04:00:00 EST 1980

OSTI ID:6377218

Behnke, R C

An internal combustion engine tappet is described comprising a sintered powdered metal wear resistant composition having a matrix formed from iron powder, carbon in the range of 0.50-1.0% by weight, and a ferroalloy powder with a mesh size of +50-325 acting as a nucleus for diffusion of the alloying metal into the surrounding iron particles. The alloying metal in the composition is in the range of 1-10% by weight and is selected from the group consisting of chromium, titanium, boron, vanadium, columbium, molybdenum, tantalum and tungsten. The iron, carbon and ferroalloy are briquetted at a pressure of 40-60 tons/sq. in. and sintered, in solid phase, at a temperature of 2000-2100 F. in a reducing atmosphere. The resulting product is heterogeneous and has hard ferroalloy nuclei and interconnected porosity with a density at the tappet wear surface of approximately 6.8-7.0 gm/cc.

• Assignee: Stanadyne, Inc.
• Patent Number(s): US 4230491
• OSTI ID: 6377218
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
CARBON ADDITIONS
ENGINES
FABRICATION
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
IRON ALLOYS
IRON BASE ALLOYS
MACHINE PARTS
MATERIALS
MECHANICAL PROPERTIES
METALLURGY
POWDER METALLURGY
SINTERED MATERIALS
SINTERING
WEAR
WEAR RESISTANCE