Development of spark plasma sintered conductive SiC–TiB2 composites for electrical discharge machining applications

Highly dense electrically conductive silicon carbide (SiC)–(0, 10, 20, and 30 vol%) titanium boride (TiB2) composites with 10 vol% of Y2O3–AlN additives were fabricated at a relatively low temperature of 1800°C by spark plasma sintering in nitrogen atmosphere. Phase analysis of sintered composites r...

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Bibliographic Details
Published inInternational journal of applied ceramic technology Vol. 19; no. 3; pp. 1367 - 1378
Main Authors Chodisetti, Surya Prakasarao, Malik, V. K., Kumar, B. Venkata Manoj
Format Journal Article
LanguageEnglish
Published Malden Wiley Subscription Services, Inc 01.05.2022
Subjects
Additives
Composite materials
Electric discharge machining
electrical discharge machining
electrical properties
Electrical resistivity
Fracture toughness
Low temperature
mechanical properties
Nitrogen
Phase transitions
Plasma sintering
Silicon carbide
Spark plasma sintering
titanium boride
Titanium diboride
Yttrium oxide
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Summary:Highly dense electrically conductive silicon carbide (SiC)–(0, 10, 20, and 30 vol%) titanium boride (TiB2) composites with 10 vol% of Y2O3–AlN additives were fabricated at a relatively low temperature of 1800°C by spark plasma sintering in nitrogen atmosphere. Phase analysis of sintered composites reveals suppressed β→α phase transformation due to low sintering temperature, nitride additives, and nitrogen sintering atmosphere. With increase in TiB2 content, hardness increased from 20.6 to 23.7 GPa and fracture toughness increased from 3.6 to 5.5 MPa m1/2. The electrical conductivity increased to a remarkable 2.72 × 103 (Ω cm)–1 for SiC–30 vol% TiB2 composites due to large amount of conductive reinforcement, additive composition, and sintering in nitrogen atmosphere. The successful electrical discharge machining illustrates potential of the sintered SiC–TiB2 composites toward extending the application regime of conventional SiC‐based ceramics.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13940