Sintered Si3N4 for High Performance Thermomechanical Applications

reportActive / Technical Report | Accession Number: ADA116121 | Open PDF

Abstract:

The gas pressure sintering GPS process for dense 99 Si3N4 containing approx. 7 wt BeSiN2 and 7 wt SiO2 as sintering aids was scaled-up to develop a property data base for use in thermomechanical applications at high approx. 1300 deg C temperatures. The fracture strength in 3-pt bend for test bars approx. 0.6 cm x 0.6 cm x 4.5 cm long was approx. 440 MNm-2 63,700 psi for a span length of 3.8 cm. There was little drop 15 in high temperature strength at 1400 deg C in air. The creep resistance was outstanding at 1300 to 1400 deg C, as evidenced by creep rates of approx. 4 x .00001h for a stress of 207 MPa 30,000 psi at 1400 C.

Author(s):
Pasco, W. D. ; Greskovich, C. D.
Author Organization(s):
GENERAL ELECTRIC CORPORATE RESEARCH AND DEVELOPMENT SCHENECTADY NY
Descriptive Note:
Final rept. 1 Jan 1981-1 Jan 1982
Supplementary Note:
DOI: 10.21236/ADA116121
Pagination:
0064

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SRD-82-045, AMMRC-TR-82-22
Contract/Grant Number(s):
DAAG46-81-C-0029, EC-76-A-1017-002
Monitor Series:
TR-82-22, AMMRC
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.1_Analyze Problem; JCA_1.2.7_Experimentation; JCA_5.2_Understand; JCA_4.2_Supply; JCA_4.2.3_Manage Global Supplier Networks; JCA_1_Force Support; JCA_6_Net Centric; JCA_1.2_Force Preparation; JCA_JCA_4.1.2_Sustain the Force; JCA_4.1_Deployment and Distribution; JCA_4.6_Engineering; JCA_4.7.2_Installation Services; JCA_4.7_Base and Installations Support; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support
Modernization Areas:
5G
Communities of Interest:
Weapons Technologies
Descriptor(s):
*SILICON NITRIDES, *SINTERING, *THERMOMECHANICS, CREEP STRENGTH, DATA BASES, FRACTURE(MECHANICS), GASES, HIGH STRENGTH, HIGH TEMPERATURE, PRESSURE, RATES
Field(s)/Group(s):
Manufacturing and Industrial Engineering and Control of Production Systems, Mechanics
Report Date:
1982 Apr 01