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Title: Method of making a functionally graded material

Abstract

A gelcasting method of making an internally graded article includes the steps of: preparing at least two slurries, each of the slurries including a different gelcastable powder suspended in a gelcasting solution, the slurries characterized by having comparable shrinkage upon drying and sintering thereof; casting the slurries into a mold having a selected shape, wherein relative proportions of the slurries is varied in at least one direction within the selected shape; gelling the slurries to form a solid gel while preserving the variation in relative proportions of the slurries; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying because of the variation in relative proportions of the starting slurries. A gelcasting method of making an internally graded article alternatively includes the steps of: preparing a slurry including a least two different phases suspended in a gelcasting solution, the phases characterized by having different settling characteristics; casting the slurry into a mold having a selected shape; allowing the slurry to stand for a sufficient period of time to permit desired gravitational fractionation in order to achieve a vertical compositional gradient in the molded slurry;more » gelling the slurry to form a solid gel while preserving the vertical compositional gradient in the molded slurry; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying along the vertical direction because of the compositional gradient in the molded slurry.« less

Inventors:
 [1];  [2];  [1]
  1. Oak Ridge, TN
  2. Clinton, TN
Publication Date:
Research Org.:
LOCKHEED MARTIN ENERGY RES COR
OSTI Identifier:
873791
Patent Number(s):
US 6248286
Assignee:
UT-Battelle, LLC (Oak Ridge, TN)
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; functionally; graded; material; gelcasting; internally; article; steps; preparing; slurries; including; gelcastable; powder; suspended; solution; characterized; comparable; shrinkage; drying; sintering; casting; mold; selected; shape; relative; proportions; varied; direction; gelling; form; solid; preserving; variation; dried; green; dry; property; varying; starting; alternatively; slurry; phases; settling; characteristics; allowing; stand; sufficient; period; time; permit; desired; gravitational; fractionation; achieve; vertical; compositional; gradient; molded; selected shape; vertical direction; casting solution; sufficient period; slurry including; gelcasting method; casting method; /264/419/

Citation Formats

Lauf, Robert J, Menchhofer, Paul A, and Walls, Claudia A. Method of making a functionally graded material. United States: N. p., 2001. Web.
Lauf, Robert J, Menchhofer, Paul A, & Walls, Claudia A. Method of making a functionally graded material. United States.
Lauf, Robert J, Menchhofer, Paul A, and Walls, Claudia A. Mon . "Method of making a functionally graded material". United States. https://www.osti.gov/servlets/purl/873791.
@article{osti_873791,
title = {Method of making a functionally graded material},
author = {Lauf, Robert J and Menchhofer, Paul A and Walls, Claudia A},
abstractNote = {A gelcasting method of making an internally graded article includes the steps of: preparing at least two slurries, each of the slurries including a different gelcastable powder suspended in a gelcasting solution, the slurries characterized by having comparable shrinkage upon drying and sintering thereof; casting the slurries into a mold having a selected shape, wherein relative proportions of the slurries is varied in at least one direction within the selected shape; gelling the slurries to form a solid gel while preserving the variation in relative proportions of the slurries; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying because of the variation in relative proportions of the starting slurries. A gelcasting method of making an internally graded article alternatively includes the steps of: preparing a slurry including a least two different phases suspended in a gelcasting solution, the phases characterized by having different settling characteristics; casting the slurry into a mold having a selected shape; allowing the slurry to stand for a sufficient period of time to permit desired gravitational fractionation in order to achieve a vertical compositional gradient in the molded slurry; gelling the slurry to form a solid gel while preserving the vertical compositional gradient in the molded slurry; drying the gel to form a dried green body; and sintering the dry green body to form a solid object, at least one property thereof varying along the vertical direction because of the compositional gradient in the molded slurry.},
doi = {},
url = {https://www.osti.gov/biblio/873791}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}

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