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Title: THE DRIVING FORCE FOR SHRINKAGE IN COPPER POWDER COMPACTS DURING THE EARLY STAGES OF SINTERING

Abstract

The shrinkage behavior, of compacts from irregular Cu powder, during the initial stages of sintering was determined by a dilatometer method. The effects of compacting pressure and of external load during sintering at a constant heating rate of 3 deg C/min upon shrinkage were observed. The residual stresses present on the surface of compacts heated at the same rate to 200, 300, 400, 500, and 600 deg C were also measured. It was observed that shrinkage starts at temperatures where considerable residual stresses in the surface of the compacts are still present, and that this temperature also depends upon the external stress applied during sintering. Residual and externally applied stresses complement each other in shifting the temperature of beginning shrinkage to lower values with increasing stress. It is concluded that, in the low temperature range up to 400 deg C, residual and externally applied stresses rather than surface tension forces cause shrinkage. (auth)

Authors:
; ; ;
Publication Date:
Research Org.:
Rensselaer Polytechnic Inst., Troy, N.Y.
OSTI Identifier:
4807857
Report Number(s):
TID-15137
NSA Number:
NSA-16-012033
DOE Contract Number:  
AT(30-1)-2408
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-62
Country of Publication:
United States
Language:
English
Subject:
METALS, CERAMICS, AND OTHER MATERIALS; BEHAVIOR; COMPACTS; COPPER; DEFORMATION; DILATATION; EXPANSION; HEATING; MEASURED VALUES; POWDERS; PRESSURE; SHRINKAGE; SINTERED MATERIALS; SINTERING; STRESSES; SURFACES; TEMPERATURE; VOLUME

Citation Formats

Lenel, F V, Hausner, H H, El Shanshoury, I A, and Ansell, G S. THE DRIVING FORCE FOR SHRINKAGE IN COPPER POWDER COMPACTS DURING THE EARLY STAGES OF SINTERING. United States: N. p., 1961. Web.
Lenel, F V, Hausner, H H, El Shanshoury, I A, & Ansell, G S. THE DRIVING FORCE FOR SHRINKAGE IN COPPER POWDER COMPACTS DURING THE EARLY STAGES OF SINTERING. United States.
Lenel, F V, Hausner, H H, El Shanshoury, I A, and Ansell, G S. Sun . "THE DRIVING FORCE FOR SHRINKAGE IN COPPER POWDER COMPACTS DURING THE EARLY STAGES OF SINTERING". United States.
@article{osti_4807857,
title = {THE DRIVING FORCE FOR SHRINKAGE IN COPPER POWDER COMPACTS DURING THE EARLY STAGES OF SINTERING},
author = {Lenel, F V and Hausner, H H and El Shanshoury, I A and Ansell, G S},
abstractNote = {The shrinkage behavior, of compacts from irregular Cu powder, during the initial stages of sintering was determined by a dilatometer method. The effects of compacting pressure and of external load during sintering at a constant heating rate of 3 deg C/min upon shrinkage were observed. The residual stresses present on the surface of compacts heated at the same rate to 200, 300, 400, 500, and 600 deg C were also measured. It was observed that shrinkage starts at temperatures where considerable residual stresses in the surface of the compacts are still present, and that this temperature also depends upon the external stress applied during sintering. Residual and externally applied stresses complement each other in shifting the temperature of beginning shrinkage to lower values with increasing stress. It is concluded that, in the low temperature range up to 400 deg C, residual and externally applied stresses rather than surface tension forces cause shrinkage. (auth)},
doi = {},
url = {https://www.osti.gov/biblio/4807857}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1961},
month = {1}
}

Technical Report:
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