Microstructure and Room‐Temperature Mechanical Properties of Hot‐Pressed Magnesium Aluminate as Described by Quadratic Multivariable Analysis
作者:
DONG M. CHAY,
HAYNE PALMOUR,
W. W. KRIEGEL,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1968)
卷期:
Volume 51,
issue 1
页码: 10-15
ISSN:0002-7820
年代: 1968
DOI:10.1111/j.1151-2916.1968.tb11819.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Polycrystalline spinel (MgA12O4), hot‐pressed in graphite dies, yielded densities ranging from ∼64 to ≊100% of theoretical. Average grain size of compacts varied from 4 to 125μ depending on hot‐pressing conditions. Room‐temperature mechanical properties also varied widely; average strengths for the 15 experimental combinations ranged from 3500 to 34,000 psi in bending and from 21,700 to 389,000 psi in compression, and Young's modulus ranged from 0.54 X lo7to 3.5 X 107psi. Variations in bulk density, average grain size, room‐temperature transverse and compressive strengths, and Young's modulus of elasticity were separately expressed as multiple quadratic regressions in terms of 1/T (temperature), In t (time), andP(pressure) over the hot‐pressing range 1227’to 1750°C, 5 to 320 min, and 1000 to 3000 psi. From these regressions, empirical equations expressing mechanical properties in terms of regression solutions of density and grain size were derived which statistically indicate a principal dependence on density and only a minor grai
点击下载:
PDF
(1073KB)
返 回