Si3N4/TiN Ceramic Composites Produced by Hot Pressing

— Si 3 N 4 /TiN ceramic composites have been prepared by hot pressing in a nitrogen atmosphere using fine Si 3 N 4 and Ti powders and CaO–Al 2 O 3 sintering aids and investigated. The results demonstrate that hot pressing was accompanied by titanium nitridation, yielding titanium nitride with the co...

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Bibliographic Details
Published inInorganic materials Vol. 59; no. 9; pp. 949 - 956
Main Authors Kim, K. A., Lysenkov, A. S., Frolova, M. G., Kargin, Yu. F.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.09.2023
Springer Nature B.V
Subjects
Aluminosilicates
Aluminum oxide
Aluminum silicates
Chemistry
Chemistry and Materials Science
Composite materials
Composition
Diamond pyramid hardness
Hot pressing
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Silicon nitride
Sintering (powder metallurgy)
Sintering aids
Titanium nitride
sialons
microhardness
silicon nitride
titanium nitride
phase analysis
ceramic composites
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Summary:— Si 3 N 4 /TiN ceramic composites have been prepared by hot pressing in a nitrogen atmosphere using fine Si 3 N 4 and Ti powders and CaO–Al 2 O 3 sintering aids and investigated. The results demonstrate that hot pressing was accompanied by titanium nitridation, yielding titanium nitride with the composition TiN 0.9 . Reaction between silicon nitride and the sintering aid led to the formation of a Ca-α-SiAlON with the composition Ca 0.67 (Si 10 Al 2 )(N 15.3 O 0.7 ). In addition to the major phases, calcium aluminosilicate with the composition Ca 3 Al 2 Si 3 O 12 was identified. Increasing the percentage of titanium nitride in the composites prepared at a temperature of 1650°C led to an increase in their density and Vickers microhardness: from 3.18 ± 0.03 to 4.33 ± 0.03 g/cm 3 and from 17 ± 1.1 to 29.4 ± 0.9 GPa, respectively.
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168523090066