中國有色金屬學(xué)報(bào)
ZHONGGUO YOUSEJINSHU XUEBAO
| 第18卷 第11期 總第116期 2008年11月 |
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文章編號(hào)：1004-0609(2008)11-2068-08
氧化釔對(duì)CaO-BaO-Al2O3-SiO2-GeO2系玻璃結(jié)構(gòu)與性能的影響
肖卓豪，左成鋼，朱立剛，陳媛媛，盧安賢
(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；
2. 中南大學(xué) 有色金屬材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 采用傳統(tǒng)熔體冷卻法制備氧化釔含量為0~6.84%(摩爾分?jǐn)?shù))系列的多元鍺酸鹽玻璃，研究氧化釔含量對(duì)CaO-BaO-Al2O3-SiO2-GeO2玻璃系統(tǒng)的性能與結(jié)構(gòu)的影響。結(jié)果表明：該系統(tǒng)玻璃的密度、玻璃轉(zhuǎn)變溫度和熱膨脹系數(shù)隨氧化釔含量的增加而升高，玻璃的化學(xué)穩(wěn)定性隨氧化釔含量的增加而下降；在玻璃中加入1.80%氧化釔后，玻璃的抗彎強(qiáng)度值由53.52 MPa增至109.65 MPa；繼續(xù)增大氧化釔的含量至6.84%時(shí)，玻璃的抗彎強(qiáng)度維持在110 MPa左右；氧化釔的加入減少玻璃網(wǎng)絡(luò)結(jié)構(gòu)中非橋氧數(shù)量，使孤立的島狀網(wǎng)絡(luò)單元重新聚合，增強(qiáng)玻璃的網(wǎng)絡(luò)結(jié)構(gòu)。同時(shí)，由于玻璃網(wǎng)絡(luò)結(jié)構(gòu)的變化，減少羥基的形成幾率，降低玻璃中羥基的含量。
關(guān)鍵字: 鍺酸鹽玻璃；氧化釔；抗彎強(qiáng)度；結(jié)構(gòu)
Effects of yttria on structure and properties of CaO-BaO-Al2O3-SiO2-GeO2 glasses
XIAO Zhuo-hao, ZUO Cheng-gang, ZHU Li-gang, CHEN Yuan-yuan, LU An-xian
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Non-ferrous Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract: Germanate glasses in CaO-BaO-Al2O3-SiO2-GeO2 system with the yttria contents of 0−6.84% (mole fraction) were prepared by conventional melt quenching technique. The effects of yttria contents on structure and properties of the glass system were investigated. The results show that the density of glass, glass transition temperature and thermal expansion coefficient increase with the increase of yttria content, and the chemical durability decreases with the increase of yttria content. The bend strength of glass increases from 53.52 MPa to 109.65 MPa when 1.80% Y2O3 (mole fraction) is added into glass. However, with the content of yttria further increases to 6.84%, the bend strength is suspended about 110 MPa. Y2O3 acting as network modifies in the structure and makes the island-shape network unit repolymerization by the bonding of Ge-O-Y because of the decrease of non-bridge oxygens (NBOs) and strengthening of glass network structure. At the same time, the change of glass network structure reduces the formation probability of hydroxy, so the content of hydroxy in germanate glass decreases.
Key words: germanate glass; yttria; bend strength; structure
