Effects of Heat Treatment for Phase Separation on the Pore Structure of Porous Glasses
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ホウケイ酸ガラス(Na20,5 B20,12.7 SiO2)を熱処理して分相を起こさせ,それを2NHCIで溶出して多孔性ガラスを得た。熱処理条件(温度と時間)の異なる種々の多孔性ガラスについて0Cでベンゼンあるいはメタノールの収着等温線を測定した毛管凝縮理論に基づいて実験結果から細孔構造の変化を検討し,熱処理温度および時間とともに鼠径孔が規則的に増加することから,シリカに富む分相粒が成長すること,分相粒粒間の可溶相が溶出したあとが細孔になることを結論した。このことは分相こ粒径が5～600Aに成長した試料ではHCI溶出量と飽和収着量とが,体積的によく対応する実験事実からも支持された,熱処理温度が500C以下の試料では(1)型の等温線を与え,その主要な細昇半径かは20A以下であり,ベンゼンならびにメタノール分子に対して分子ふるい効果のある微細孔も混在することが明らかになった。この実験結果から得た結論はガラス分相に関する従来の知見と大綱において等しい。毛管凝縮理論に基づく蒸気収着法は細孔検出能がすぐれているからガラスの分相研究に有用なことを明らかにした。Cite
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Vickers hardness test
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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ZrB2 based composites containing 10 vol.-% carbon nanotubes (CNTs) are synthesised by spark plasma sintering at temperatures ranging from 1600 to 18008C and at an applied pressure of 25 MPa. The effects of sintering temperature on densification behaviour, microstructural evolutions and mechanical properties are presented. Results indicate that ZrB2-CNT composites fabricated at 16508C have the optimal combination of dense microstructure and properties. The fracture toughness is sensitive to the temperature change and reaches 7.2 MPa m1/2 for the CNT toughened ZrB2 ceramics, which is higher than the measured result for monolithic ZrB2 (3.3 MPa m1/2). The crack deflection and CNT pullout are the dominant toughening mechanisms.
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