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熱處理溫度對(duì)非晶晶化法制備ZrO2-Mullite納米復(fù)相陶瓷結(jié)構(gòu)與力學(xué)性能的影響
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國(guó)家“863”計(jì)劃(2003AA332040)；國(guó)家自然科學(xué)基金創(chuàng)新群體項(xiàng)目(50721003)


Effects of Heat-Treatment Temperature on Structure and Mechanical Properties of ZrO2-Mullite Nano-Composite Ceramics Fabricated by in-situ Crystallization
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    摘要:

    采用非晶原位晶化法從Si-Al-Zr-O(SAZ)系非晶中制備ZrO2-mullite納米復(fù)相陶瓷。用XRD、IR和SEM技術(shù)對(duì)前驅(qū)體非晶以及晶化后試樣進(jìn)行表征，并著重研究熱處理溫度對(duì)ZrO2-mullite納米復(fù)相陶瓷結(jié)構(gòu)與力學(xué)性能的影響。結(jié)果表明，前驅(qū)體SAZ非晶經(jīng)960 ℃熱處理開始析出t-ZrO2 晶體，1000 ℃時(shí)莫來(lái)石晶相形成。試樣經(jīng)低溫950~1000 ℃和高溫1100~1250℃梯度熱處理后，t-ZrO2、mullite成為主晶相，同時(shí)生成c-SiO2。其中低溫階段的核化溫度對(duì)陶瓷試樣的顯微結(jié)構(gòu)和斷裂韌性產(chǎn)生重大影響。當(dāng)核化溫度由950升至1000 ℃時(shí)，納米顆粒明顯增大，斷裂韌性急劇下降；而高溫階段的晶化溫度對(duì)力學(xué)性能影響相對(duì)較小。隨著晶化溫度的升高，試樣的斷裂韌性和抗彎強(qiáng)度均先略有增加隨后下降。試樣經(jīng)950 ℃核化、1150 ℃晶化后取得最佳力學(xué)性能：斷裂韌性5.13 MPa·m1/2 和抗彎強(qiáng)度521 MPa

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    ZrO2-mullite nano-composite ceramics were prepared by in-situ crystallization of Si-Al-Zr-O (SAZ) amorphous bulk. The amorphous bulk and as-prepared ceramics were characterized by XRD, IR and SEM. The influence of heat-treatment temperature on the structure and mechanical properties of ZrO2-mullite nano-composite ceramics was investigated. The results show that the t-ZrO2 began to form after 960 oC heat treatment of SAZ bulk and mullite was crystallized at 1000 oC in the amorphous bulks. The main phases were identified as t-ZrO2 and mullite, and at the same time cristobalite formed by a two-step gradient heat treatment at 950-1000 oC and 1100-1250 oC. The first-step nucleation temperature has a great effect on the microstructure and fracture toughness, and with the increase of the temperature from 950 oC to 1000 oC, the nano-particle size increases but the fracture toughness decreases sharply. However, the influence of the second-step crystallization temperature on the mechanical properties is not obvious. The fracture toughness and flexural strength increase gradually, and then decreases as the crystallization temperature increasing. The nano-composite ceramics exhibit the best mechanical properties, including the flexural strength up to 521 MPa and the fracture toughness up to 5.13 MPa·m1/2 after 950 oC nucleation and then 1150 oC crystallization

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譚小平,梁叔全,張 勇,鐘 杰.熱處理溫度對(duì)非晶晶化法制備ZrO2-Mullite納米復(fù)相陶瓷結(jié)構(gòu)與力學(xué)性能的影響[J].稀有金屬材料與工程,2010,39(6):1094~1098.[Tan Xiaoping, Liang Shuquan, Zhang Yong, Zhang Yong. Effects of Heat-Treatment Temperature on Structure and Mechanical Properties of ZrO2-Mullite Nano-Composite Ceramics Fabricated by in-situ Crystallization[J]. Rare Metal Materials and Engineering,2010,39(6):1094~1098.]
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  • 收稿日期:2009-06-21
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