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Title: Method for thermal processing alumina-enriched spinel single crystals

Abstract

A process is described for age-hardening alumina-rich magnesium aluminum spinel to obtain the desired combination of characteristics of hardness, clarity, flexural strength and toughness. The process 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. 10 figs.

Inventors:
Publication Date:
Research Org.:
Du Pont de Nemours (E.I.) and Co., Aiken, SC (USA)
Sponsoring Org.:
DOE/DP
OSTI Identifier:
6712922
Alternate Identifier(s):
OSTI ID: 6712922; Legacy ID: DE90014602
Patent Number(s):
PATENTS-US-A7363020
Application Number:
ON: DE90014602; PPN: US 7-363020
Assignee:
Dept. of Energy SRS; EDB-90-124083; NTS-90-019813
DOE Contract Number:  
AC09-76SR00001
Resource Type:
Patent Application
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SPINELS; AGE HARDENING; ALUMINIUM OXIDES; FLEXURAL STRENGTH; HARDNESS; HEAT TREATMENTS; INVENTIONS; MECHANICAL PROPERTIES; MICROSTRUCTURE; MONOCRYSTALS; PROCESSING; ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; CRYSTALS; HARDENING; MAGNESIUM COMPOUNDS; MAGNESIUM OXIDES; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS 360201* -- Ceramics, Cermets, & Refractories-- Preparation & Fabrication; 360203 -- Ceramics, Cermets, & Refractories-- Mechanical Properties

Citation Formats

Jantzen, C.M. Method for thermal processing alumina-enriched spinel single crystals. United States: N. p., 1989. Web.
Jantzen, C.M. Method for thermal processing alumina-enriched spinel single crystals. United States.
Jantzen, C.M. Thu . "Method for thermal processing alumina-enriched spinel single crystals". United States.
@article{osti_6712922,
title = {Method for thermal processing alumina-enriched spinel single crystals},
author = {Jantzen, C.M.},
abstractNote = {A process is described for age-hardening alumina-rich magnesium aluminum spinel to obtain the desired combination of characteristics of hardness, clarity, flexural strength and toughness. The process 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. 10 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jun 08 00:00:00 EDT 1989},
month = {Thu Jun 08 00:00:00 EDT 1989}
}