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Title: Evaluation and silicon nitride internal combustion engine components. Final report, Phase I

The feasibility of silicon nitride (Si{sub 3}N{sub 4}) use in internal combustion engines was studied by testing three different components for wear resistance and lower reciprocating mass. The information obtained from these preliminary spin rig and engine tests indicates several design changes are necessary to survive high-stress engine applications. The three silicon nitride components tested were valve spring retainers, tappet rollers, and fuel pump push rod ends. Garrett Ceramic Components` gas-pressure sinterable Si{sub 3}N{sub 4} (GS-44) was used to fabricate the above components. Components were final machined from densified blanks that had been green formed by isostatic pressing of GS-44 granules. Spin rig testing of the valve spring retainers indicated that these Si{sub 3}N{sub 4} components could survive at high RPM levels (9,500) when teamed with silicon nitride valves and lower spring tension than standard titanium components. Silicon nitride tappet rollers showed no wear on roller O.D. or I.D. surfaces, steel axles and lifters; however, due to the uncrowned design of these particular rollers the cam lobes indicated wear after spin rig testing. Fuel pump push rod ends were successful at reducing wear on the cam lobe and rod end when tested on spin rigs and in real-world race applications.
Authors:
 [1]
  1. Allied-Signal Aerospace Co., Torrance, CA (United States). Garrett Ceramic Components Div.
Publication Date:
OSTI Identifier:
10191276
Report Number(s):
ORNL/Sub--89-SE500/1
ON: DE93003628
DOE Contract Number:
AC05-84OR21400
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1992
Research Org:
Oak Ridge National Lab., TN (United States); Allied-Signal Aerospace Co., Torrance, CA (United States). Garrett Ceramic Components Div.
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 36 MATERIALS SCIENCE; SILICON NITRIDES; FABRICATION; EVALUATION; INTERNAL COMBUSTION ENGINES; MATERIALS; PROGRESS REPORT; WEAR RESISTANCE; MATERIALS TESTING; VALVES; PUMPS; AUTOMOTIVE ACCESSORIES; CERAMICS; MACHINING 330100; 360201; 360203; INTERNAL COMBUSTION ENGINES; PREPARATION AND FABRICATION; MECHANICAL PROPERTIES