Method of preparing thermal insulation for high temperature microwave sintering operations

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870509

Holcombe, Cressie E ^[1]; Dykes, Norman L ^[2]; Morrow, Marvin S ^[3]

---

1. Knoxville, TN
2. Oak Ridge, TN
3. Kingston, TN

Superior microwave transparent thermal insulations for high temperature microwave sintering operations were prepared. One embodiment of the thermal insulation comprises granules of boron nitride coated with a very thin layer of glassy carbon made by preparing a glassy carbon precursor and blending it with boron nitride powder to form a mixture. The blended mixture is granulated to form a grit which is dried and heated to form the granules of boron nitride coated with a glassy carbon. Alternatively, grains of glassy carbon are coated with boron nitride by blending a mixture of a slurry comprising boron nitride, boric acid binder, and methyl alcohol with glassy carbon grains to form a blended mixture. The blended mixture is dried to form grains of glassy carbon coated with boron nitride. In addition, a physical mixture of boron nitride powder and glassy carbon grains has also been shown to be an excellent thermal insulation material for microwave processing and sintering.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: AC05-84OR21400
• Assignee: Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
• Patent Number(s): US 5536292
• OSTI ID: 870509
• Country of Publication: United States
• Language: English

Related Subjects

method
preparing
thermal
insulation
temperature
microwave
sintering
operations
superior
transparent
insulations
prepared
embodiment
comprises
granules
boron
nitride
coated
layer
glassy
carbon
precursor
blending
powder
form
mixture
blended
granulated
grit
dried
heated
alternatively
grains
slurry
comprising
boric
acid
binder
methyl
alcohol
addition
physical
shown
excellent
material
processing
carbon coated
nitride coated
blended mixture
comprising boron
physical mixture
slurry comprising
nitride powder
microwave sintering
thermal insulation
boric acid
boron nitride
glassy carbon
carbon precursor
microwave transparent
thermal insulations
acid binder
sintering operations
microwave processing
excellent thermal
transparent thermal
temperature microwave
insulation material
superior microwave
microwave process
/65/252/501/