Processing and Properties of TiB2 with MoSi2 Sinter-additive: A First Report
The densification of non‐oxide ceramics like titanium boride (TiB2) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borid...
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Veröffentlicht in: | Journal of the American Ceramic Society 2006-01, Vol.89 (1), p.131-138 |
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creator | Murthy, T. S. R. Ch Basu, B. Balasubramaniam, R. Suri, A. K. Subramanian, C. Fotedar, R. K. |
description | The densification of non‐oxide ceramics like titanium boride (TiB2) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borides for high‐temperature applications. This contribution, for the first time, reports the sintering, microstructure, and properties of TiB2 materials densified using a MoSi2 sinter‐additive. The densification experiments were carried out using a hot‐pressing and pressureless sintering route. The binderless densification of monolithic TiB2 to 98% theoretical density with 2–5 μm grain size was achieved by hot pressing at 1800°C for 1 h in vacuum. The addition of 10–20 wt% MoSi2 enables us to achieve 97%–99%ρth in the composites at 1700°C under similar hot‐pressing conditions. The densification mechanism is dominated by liquid‐phase sintering in the presence of TiSi2. In the pressureless sintering route, a maximum of 90%ρth is achieved after sintering at 1900°C for 2 h in an (Ar+H2) atmosphere. The hot‐pressed TiB2–10 wt% MoSi2 composites exhibit high Vickers hardness (∼26–27 GPa) and modest indentation toughness (∼4–5 MPa·m1/2). |
doi_str_mv | 10.1111/j.1551-2916.2005.00652.x |
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S. R. Ch ; Basu, B. ; Balasubramaniam, R. ; Suri, A. K. ; Subramanian, C. ; Fotedar, R. K.</creator><creatorcontrib>Murthy, T. S. R. Ch ; Basu, B. ; Balasubramaniam, R. ; Suri, A. K. ; Subramanian, C. ; Fotedar, R. K.</creatorcontrib><description>The densification of non‐oxide ceramics like titanium boride (TiB2) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borides for high‐temperature applications. This contribution, for the first time, reports the sintering, microstructure, and properties of TiB2 materials densified using a MoSi2 sinter‐additive. The densification experiments were carried out using a hot‐pressing and pressureless sintering route. The binderless densification of monolithic TiB2 to 98% theoretical density with 2–5 μm grain size was achieved by hot pressing at 1800°C for 1 h in vacuum. The addition of 10–20 wt% MoSi2 enables us to achieve 97%–99%ρth in the composites at 1700°C under similar hot‐pressing conditions. The densification mechanism is dominated by liquid‐phase sintering in the presence of TiSi2. In the pressureless sintering route, a maximum of 90%ρth is achieved after sintering at 1900°C for 2 h in an (Ar+H2) atmosphere. The hot‐pressed TiB2–10 wt% MoSi2 composites exhibit high Vickers hardness (∼26–27 GPa) and modest indentation toughness (∼4–5 MPa·m1/2).</description><identifier>ISSN: 0002-7820</identifier><identifier>EISSN: 1551-2916</identifier><identifier>DOI: 10.1111/j.1551-2916.2005.00652.x</identifier><identifier>CODEN: JACTAW</identifier><language>eng</language><publisher>Malden, USA: Blackwell Science Inc</publisher><subject>Applied sciences ; Building materials. Ceramics. 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S. R. Ch</creatorcontrib><creatorcontrib>Basu, B.</creatorcontrib><creatorcontrib>Balasubramaniam, R.</creatorcontrib><creatorcontrib>Suri, A. K.</creatorcontrib><creatorcontrib>Subramanian, C.</creatorcontrib><creatorcontrib>Fotedar, R. K.</creatorcontrib><title>Processing and Properties of TiB2 with MoSi2 Sinter-additive: A First Report</title><title>Journal of the American Ceramic Society</title><description>The densification of non‐oxide ceramics like titanium boride (TiB2) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borides for high‐temperature applications. This contribution, for the first time, reports the sintering, microstructure, and properties of TiB2 materials densified using a MoSi2 sinter‐additive. The densification experiments were carried out using a hot‐pressing and pressureless sintering route. The binderless densification of monolithic TiB2 to 98% theoretical density with 2–5 μm grain size was achieved by hot pressing at 1800°C for 1 h in vacuum. The addition of 10–20 wt% MoSi2 enables us to achieve 97%–99%ρth in the composites at 1700°C under similar hot‐pressing conditions. The densification mechanism is dominated by liquid‐phase sintering in the presence of TiSi2. In the pressureless sintering route, a maximum of 90%ρth is achieved after sintering at 1900°C for 2 h in an (Ar+H2) atmosphere. The hot‐pressed TiB2–10 wt% MoSi2 composites exhibit high Vickers hardness (∼26–27 GPa) and modest indentation toughness (∼4–5 MPa·m1/2).</description><subject>Applied sciences</subject><subject>Building materials. Ceramics. Glasses</subject><subject>Ceramic industries</subject><subject>Ceramic sintering</subject><subject>Chemical industry and chemicals</subject><subject>Exact sciences and technology</subject><subject>High temperature</subject><subject>Materials science</subject><subject>Metal matrix composites</subject><subject>Microstructure</subject><subject>Physical properties</subject><subject>Structural ceramics</subject><subject>Technical ceramics</subject><issn>0002-7820</issn><issn>1551-2916</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqNkU1vEzEQhi1EJULhP1hI5bZbf6ztcS8oRP1CaUFpEEfLXXtbh-1usDc0_ff1NlWRuIAv9mgevTPWgxCmpKT5HK5KKgQtmKayZISIkhApWLl9hSYvjddoQghhhQJG3qC3Ka1ySTVUEzT_FvvapxS6G2w7h3O59nEIPuG-wcvwmeH7MNzii_4qMHwVusHHwjoXhvDbH-EpPgkxDXjh130c3qG9xrbJv3--99H3k-Pl7KyYfz09n03nRagqzQqmgIpaWe2YuOY1Ay05sLyOsyCFkNBYTRVxTqpraHiliRNOAdBGamI58H30cZe7jv2vjU-DuQup9m1rO99vkmFacADO_w0qLQVw9j-gUIKTDH74C1z1m9jl3xpGVV5bVuPYg2fIptq2TbRdHZJZx3Bn44PJkBZa0cx92nH3ofUPf_rEjGrNyowGzWjQjGrNk1qzNV-ms-Ond04odgkhDX77kmDjTyMVV8L8uDw1YnYJsIClWfBHoROkvw</recordid><startdate>200601</startdate><enddate>200601</enddate><creator>Murthy, T. 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K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Processing and Properties of TiB2 with MoSi2 Sinter-additive: A First Report</atitle><jtitle>Journal of the American Ceramic Society</jtitle><date>2006-01</date><risdate>2006</risdate><volume>89</volume><issue>1</issue><spage>131</spage><epage>138</epage><pages>131-138</pages><issn>0002-7820</issn><eissn>1551-2916</eissn><coden>JACTAW</coden><abstract>The densification of non‐oxide ceramics like titanium boride (TiB2) has always been a major challenge. The use of metallic binders to obtain a high density in liquid phase‐sintered borides is investigated and reported. However, a non‐metallic sintering additive needs to be used to obtain dense borides for high‐temperature applications. This contribution, for the first time, reports the sintering, microstructure, and properties of TiB2 materials densified using a MoSi2 sinter‐additive. 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subjects | Applied sciences Building materials. Ceramics. Glasses Ceramic industries Ceramic sintering Chemical industry and chemicals Exact sciences and technology High temperature Materials science Metal matrix composites Microstructure Physical properties Structural ceramics Technical ceramics |
title | Processing and Properties of TiB2 with MoSi2 Sinter-additive: A First Report |
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