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Method for thermal processing alumina-enriched spinel single crystals

Patent ·
OSTI ID:869876
 [1]
  1. Aiken, SC
+ Show Author Affiliations
A process for age-hardening alumina-rich magnesium aluminum spinel to obtain the desired combination of characteristics of hardness, clarity, flexural strength and toughness comprises selection of the time-temperature pair for isothermal heating followed by quenching. The time-temperature pair is selected from the region wherein the precipitate groups have the characteristics sought. The single crystal spinel is isothermally heated and will, if heated long enough pass from its single phase through two pre-precipitates and two metastable precipitates to a stable secondary phase precipitate within the spinel matrix. Quenching is done slowly at first to avoid thermal shock, then rapidly.
Research Organization:
E I DUPONT DE NEMOURS & CO INC
DOE Contract Number:
AC09-76SR00001
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 5413973
OSTI ID:
869876
Country of Publication:
United States
Language:
English

References (9)

Strength of Flame - Fusion - Grown Magnesium - Aluminum Spinel journal December 1969
Die Entmischung Al 2 O 3 -übersättigter Mg - Al -Spinelle journal January 1957
Precipitation in non-stoichiometric magnesium aluminate spinel journal April 1974
Precipitation Strengthening in Non-Stoichiometric Mg-Al Spinel book January 1974
Precipitation and Toughness in Alumina-Rich Spinel Single Crystals book January 1986
Precipitation in non-stoichiometric spinel journal May 1982
Growth and Characterization of Spinel Single Crystals for Substrate Use in Integrated Electronics journal August 1969
Precipitation in non-stoichiometric spinel crystals journal November 1969
Knoop Microhardness Anisotropy of Single-Crystal Stoichiometric MgAl2O4 Spinel journal April 1987

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age-hardening
alumina-enriched
alumina-rich
aluminum
avoid
characteristics
clarity
combination
comprises
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crystal
crystals
desired
flexural
flexural strength
followed
hardness
heated
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heating followed
isothermal
isothermally
magnesium
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metastable
method
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pair
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process
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quenching
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region
secondary
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single
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slowly
sought
spinel
stable
strength
thermal
thermal heat
thermal processing
thermal shock
time-temperature
toughness