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Studies of valve lifter for automotive heavy duty diesel engine by ceramic materials. II. Development of SiC valve lifter by injection molding method

Journal Article:

Abstract

Valve lifter, namely tappet, is supported by lifter hole which is located upper side of camshaft in cylinder block, transforms rotatic movement of camshaft into linear movement and helps to open and shut the engine valve as an engine parts. The face of valve lifter, which is continuously contacting with camshaft, brings about abnormal wears, such as unfair wear and early wear, because it is severely loaded in the valve train system. These wears act as a defect like over-clearance and cause imperfect combustion of fuel during the valve lifting in the combustion chamber. Consequently, this imperfect combustion makes the engine out-put decrease and has cause on air pollution. To prevent these wears, therefore, the valve lifter cast in metal developed into SiC ceramics valve lifter which has an excellence in wear and impact resistance. As a result, the optimum process conditions like injection condition, mixture ratio and debonding process could be established. After sintering, fine-sinered dual microstructure in which prior {alpha}-SiC, carbon and silicon was obtained. Based on the new SiC({beta}-SiC) produced by reaction among the {alpha}-SiC, carbon and silicon was obtained. Based on the study, it is verified that mechanical properties of SiC valve lifter are excellent in  More>>
Authors:
Yun, H W; [1]  Han, I S; [2]  Lim, Y S; Chung, Y J [3] 
  1. Technical Centre of KIA-ASIA MOTORS (Korea, Republic of)
  2. Korea Institute of Energy Research, Tajeon (Korea, Republic of)
  3. Myong Ji University (Korea, Republic of)
Publication Date:
Feb 01, 1998
Product Type:
Journal Article
Reference Number:
SCA: 360201; PA: KR-99:000061; EDB-99:009602; SN: 99002045054
Resource Relation:
Journal Name: Yo-eob hag-hoeji (Journal of the Korean Ceramic Society); Journal Volume: 35; Journal Issue: 2; Other Information: PBD: Feb 1998
Subject:
36 MATERIALS SCIENCE; VALVES; CERAMICS; MOLDING; DIESEL ENGINES; AIR POLLUTION; SINTERING; CARBON; SILICON; MECHANICAL PROPERTIES; VICKERS HARDNESS; FRACTURE PROPERTIES; WEAR RESISTANCE
OSTI ID:
298691
Country of Origin:
Korea, Republic of
Language:
Korean
Other Identifying Numbers:
Journal ID: XZ747T; ISSN 1225-1372; TRN: KR9900061
Submitting Site:
KR
Size:
pp. 172-179
Announcement Date:

Journal Article:

Citation Formats

Yun, H W, Han, I S, Lim, Y S, and Chung, Y J. Studies of valve lifter for automotive heavy duty diesel engine by ceramic materials. II. Development of SiC valve lifter by injection molding method. Korea, Republic of: N. p., 1998. Web.
Yun, H W, Han, I S, Lim, Y S, & Chung, Y J. Studies of valve lifter for automotive heavy duty diesel engine by ceramic materials. II. Development of SiC valve lifter by injection molding method. Korea, Republic of.
Yun, H W, Han, I S, Lim, Y S, and Chung, Y J. 1998. "Studies of valve lifter for automotive heavy duty diesel engine by ceramic materials. II. Development of SiC valve lifter by injection molding method." Korea, Republic of.
@misc{etde_298691,
title = {Studies of valve lifter for automotive heavy duty diesel engine by ceramic materials. II. Development of SiC valve lifter by injection molding method}
author = {Yun, H W, Han, I S, Lim, Y S, and Chung, Y J}
abstractNote = {Valve lifter, namely tappet, is supported by lifter hole which is located upper side of camshaft in cylinder block, transforms rotatic movement of camshaft into linear movement and helps to open and shut the engine valve as an engine parts. The face of valve lifter, which is continuously contacting with camshaft, brings about abnormal wears, such as unfair wear and early wear, because it is severely loaded in the valve train system. These wears act as a defect like over-clearance and cause imperfect combustion of fuel during the valve lifting in the combustion chamber. Consequently, this imperfect combustion makes the engine out-put decrease and has cause on air pollution. To prevent these wears, therefore, the valve lifter cast in metal developed into SiC ceramics valve lifter which has an excellence in wear and impact resistance. As a result, the optimum process conditions like injection condition, mixture ratio and debonding process could be established. After sintering, fine-sinered dual microstructure in which prior {alpha}-SiC, carbon and silicon was obtained. Based on the new SiC({beta}-SiC) produced by reaction among the {alpha}-SiC, carbon and silicon was obtained. Based on the study, it is verified that mechanical properties of SiC valve lifter are excellent in Vickers hardness 1100{approx}1200 bending strength (300{approx}350 Pa), fracture toughness (1.5{approx}1.7 MPacentre dotm{sup 1/2}). Through engine dynamo testing, SiC valve lifter and metal valve lifter are examined and compared into abnormal phenomena such early fracture, unfair and early wear. It is hoped that this research will serve as an important springboard for the future study of heavy duty diesel engine parts developed by ceramics which has a good wear resistance, reliability, and lightability.}
journal = {Yo-eob hag-hoeji (Journal of the Korean Ceramic Society)}
issue = {2}
volume = {35}
journal type = {AC}
place = {Korea, Republic of}
year = {1998}
month = {Feb}
}