Studies on the scale-up of the microwave-assisted nitridation and sintering of reaction-bonded silicon nitride Page: 2 of 6
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5 wt.% each of A1203 and Y203 sintering aids. The green density of the buckets was 1.72
Nitridation and sintering of the bucket tappets was conducted in a 500-liter cylindrical
multimode cavity equipped with a 6-kW, 2.45-GHz power supply. Samples were placed into
crucibles composed of boron nitrideb (BN), BN and silicon carbidec (SiC), and reaction-bonded
silicon nitride (RBSN), which were then insulated by a 5-cm layer of powder consisting of 83
wt.% Si3N4d, 15 wt.% boron nitride (BN), and 2 wt.% Y203 e. The crucibles and powder were
held in 2.5 cm wall thickness alumina fiberboard box (Figure la).
Two sets of microwave experiments were performed in this study. The first set involved three
nitridation and sintering runs, in which parts were placed in one of three different (BN)
cylindrical crucibles either in a single layer of four samples, two layers of four samples each, or
three layers of seven samples each (Figure ib). In the second series of microwave heating
experiments, samples were processed in one of three crucibles, each designed to accommodate a
single layer of nine samples, as shown in Figure 2. The three crucibles were made of three
different material combinations. Crucible 1 was made of all BN. Crucible 2 had a BN top and
bottom, and SiC sides. Crucible 3 consisted of a RBSN box with a removable RBSN lid, and
contained a bottom BN setter plate within the crucible.
Four samples per layer
- Powder Insulation
Seven samples per layer
Figure 1. Drawing showing the insulation
package used for the first series of
microwave processing experiments including
a) a cross section view of the entire package
and b) a top view of the two possible sample
1 2 3
Type "C" Thermocouples
4 5 6 Samples
1 2 3 Crucible
TC 3 TC 2 TC l
Type "C" Thermocoupes
Figure 2. Drawing of insulation package used
in the second series of microwave processing
experiments including a) a cross section view
and b) a top view.
bAdvanced Ceramics Co., Cleveland, Ohio; Grade HCP BN
cNorton Co., Worcester, MA
dStarck, Berlin, Germany; Grade S1 Si3N4
eMolycorp, White Plains, NY; Grade 5600
fFoseco,Inc., Cleveland, Ohio; Grade Procal HT-310C
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Kiggans, J.O.: Tiegs, T.N. & Kimrey, H.D. Studies on the scale-up of the microwave-assisted nitridation and sintering of reaction-bonded silicon nitride, article, May 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc670341/m1/2/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.