Diphasic mullite gel pressed at 1.5 GPa : Mechanical properties and microstructure of ceramics
Mullite gels containing 72–85 wt% Al2O3 were prepared by mixing commercial boehmite and silica sols and gelled by heating. Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels t...
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Veröffentlicht in: | Journal of materials science 1997, Vol.32 (12), p.3195-3199 |
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description | Mullite gels containing 72–85 wt% Al2O3 were prepared by mixing commercial boehmite and silica sols and gelled by heating. Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels than for the dried gels. The bulk density and room-temperature flexural strength of ceramics increased with increasing compacting pressure, while the fracture toughness is independent of the pressure. Mullite containing 75 wt% Al2O3 and sintered at 1500°C for 3 h has a density which is about 99% of the theoretical density, a flexural strength of 523±40 MPa and a fracture toughness of 3.5 MPa m1/2. |
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Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels than for the dried gels. The bulk density and room-temperature flexural strength of ceramics increased with increasing compacting pressure, while the fracture toughness is independent of the pressure. Mullite containing 75 wt% Al2O3 and sintered at 1500°C for 3 h has a density which is about 99% of the theoretical density, a flexural strength of 523±40 MPa and a fracture toughness of 3.5 MPa m1/2.</description><identifier>ISSN: 0022-2461</identifier><identifier>EISSN: 1573-4803</identifier><identifier>DOI: 10.1023/A:1018606902702</identifier><identifier>CODEN: JMTSAS</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Aluminum oxide ; Applied sciences ; Boehmite ; Building materials. Ceramics. Glasses ; Bulk density ; Ceramic industries ; Ceramics ; Chemical industry and chemicals ; Cold isostatic pressing ; Compacting ; Exact sciences and technology ; Flexural strength ; Fracture toughness ; Gels ; Materials science ; Mechanical properties ; Miscellaneous ; Mullite ; Pressure effects ; Roasting ; Silica gel ; Silicon dioxide ; Sintering (powder metallurgy) ; Technical ceramics ; Theoretical density</subject><ispartof>Journal of materials science, 1997, Vol.32 (12), p.3195-3199</ispartof><rights>1997 INIST-CNRS</rights><rights>Journal of Materials Science is a copyright of Springer, (1997). 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Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels than for the dried gels. The bulk density and room-temperature flexural strength of ceramics increased with increasing compacting pressure, while the fracture toughness is independent of the pressure. Mullite containing 75 wt% Al2O3 and sintered at 1500°C for 3 h has a density which is about 99% of the theoretical density, a flexural strength of 523±40 MPa and a fracture toughness of 3.5 MPa m1/2.</description><subject>Aluminum oxide</subject><subject>Applied sciences</subject><subject>Boehmite</subject><subject>Building materials. Ceramics. Glasses</subject><subject>Bulk density</subject><subject>Ceramic industries</subject><subject>Ceramics</subject><subject>Chemical industry and chemicals</subject><subject>Cold isostatic pressing</subject><subject>Compacting</subject><subject>Exact sciences and technology</subject><subject>Flexural strength</subject><subject>Fracture toughness</subject><subject>Gels</subject><subject>Materials science</subject><subject>Mechanical properties</subject><subject>Miscellaneous</subject><subject>Mullite</subject><subject>Pressure effects</subject><subject>Roasting</subject><subject>Silica gel</subject><subject>Silicon dioxide</subject><subject>Sintering (powder metallurgy)</subject><subject>Technical ceramics</subject><subject>Theoretical density</subject><issn>0022-2461</issn><issn>1573-4803</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1997</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNkL1PwzAQxS0EEqUws1oCsaXY5_oj3aoCBakIBliJro5NXaVJsJOB_55UdGJietK9n-7ePUIuOZtwBuJ2PuOMG8VUzkAzOCIjLrXIpoaJYzJiDCCDqeKn5CylLWNMauAj8nEX2g2mYOmur6rQOfrpKtpGl5IrKXaUTyRdviKd0WdnN1gHi3u_aV3sgksU65Lugo1N6mJvuz462nhqXcRhms7JiccquYuDjsn7w_3b4jFbvSyfFvNVZgU3XSZyt17b3GOpNAeLjiFH6YzUXnldwhq1KIVV-aCG595b5c1aD9wUmAQpxuTmd--Q7Kt3qSt2IVlXVVi7pk8FKCl5bsR_QM4E7MGrP-C26WM9PFEAyFwbrsz-7vWBwjQU4yPWNqSijWGH8bsALXIDSvwAFnR86w</recordid><startdate>1997</startdate><enddate>1997</enddate><creator>PACH, L</creator><creator>MANKOS, P</creator><general>Springer</general><general>Springer Nature B.V</general><scope>IQODW</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7SR</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>1997</creationdate><title>Diphasic mullite gel pressed at 1.5 GPa : Mechanical properties and microstructure of ceramics</title><author>PACH, L ; MANKOS, P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c318t-39ebbc9fad6712cae0a1a5e857f6f7d2ba73d3c69a73819ffc6f8b7ae04205253</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1997</creationdate><topic>Aluminum oxide</topic><topic>Applied sciences</topic><topic>Boehmite</topic><topic>Building materials. Ceramics. Glasses</topic><topic>Bulk density</topic><topic>Ceramic industries</topic><topic>Ceramics</topic><topic>Chemical industry and chemicals</topic><topic>Cold isostatic pressing</topic><topic>Compacting</topic><topic>Exact sciences and technology</topic><topic>Flexural strength</topic><topic>Fracture toughness</topic><topic>Gels</topic><topic>Materials science</topic><topic>Mechanical properties</topic><topic>Miscellaneous</topic><topic>Mullite</topic><topic>Pressure effects</topic><topic>Roasting</topic><topic>Silica gel</topic><topic>Silicon dioxide</topic><topic>Sintering (powder metallurgy)</topic><topic>Technical ceramics</topic><topic>Theoretical density</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>PACH, L</creatorcontrib><creatorcontrib>MANKOS, P</creatorcontrib><collection>Pascal-Francis</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Engineered Materials Abstracts</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of materials science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>PACH, L</au><au>MANKOS, P</au><au>WCA</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Diphasic mullite gel pressed at 1.5 GPa : Mechanical properties and microstructure of ceramics</atitle><jtitle>Journal of materials science</jtitle><date>1997</date><risdate>1997</risdate><volume>32</volume><issue>12</issue><spage>3195</spage><epage>3199</epage><pages>3195-3199</pages><issn>0022-2461</issn><eissn>1573-4803</eissn><coden>JMTSAS</coden><abstract>Mullite gels containing 72–85 wt% Al2O3 were prepared by mixing commercial boehmite and silica sols and gelled by heating. Powdered gels were either dried at 60°C or calcined at 550°C, and cold isostatically pressed under 0.5, 1.0 or 1.5 GPa. The effect of pressure is greater for the calcined gels than for the dried gels. The bulk density and room-temperature flexural strength of ceramics increased with increasing compacting pressure, while the fracture toughness is independent of the pressure. Mullite containing 75 wt% Al2O3 and sintered at 1500°C for 3 h has a density which is about 99% of the theoretical density, a flexural strength of 523±40 MPa and a fracture toughness of 3.5 MPa m1/2.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1023/A:1018606902702</doi><tpages>5</tpages></addata></record> |
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subjects | Aluminum oxide Applied sciences Boehmite Building materials. Ceramics. Glasses Bulk density Ceramic industries Ceramics Chemical industry and chemicals Cold isostatic pressing Compacting Exact sciences and technology Flexural strength Fracture toughness Gels Materials science Mechanical properties Miscellaneous Mullite Pressure effects Roasting Silica gel Silicon dioxide Sintering (powder metallurgy) Technical ceramics Theoretical density |
title | Diphasic mullite gel pressed at 1.5 GPa : Mechanical properties and microstructure of ceramics |
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