R_2O对ZnO-Sb_2O_3-P_2O_5低熔玻璃性能的影响  

Effect of R_2O on the Properties of ZnO-Sb_2O_3-P_2O_5 Low-melting Glasses

作　　者：张兵[1] 陈奇[1] 侯凤珍[1] 李会平[1] 

机构地区：[1]华东理工大学材料科学与工程学院无机材料系,上海200237

出　　处：《玻璃与搪瓷》2007年第6期12-16,36,共6页Glass & Enamel

摘　　要：借助IR、DTA等研究了碱金属氧化物R2O(R=Li,Na,K)对ZnO-Sb2O3-P2O5低熔玻璃结构及性能的影响。结果表明:不同种类碱金属氧化物的加入对玻璃的磷酸盐网络结构无明显影响,但K2O的引入提高了玻璃的转变温度(Tg)、软化温度(Ts)、析晶倾向和耐水性。R2O取代ZnO后破坏了玻璃的网络结构,导致玻璃的Tg及Ts温度和耐水性的降低,增加了玻璃的析晶倾向。在总碱量不变的条件下,借助混合碱效应,调节Li2O/(Li2O+Na2O)摩尔比能够获得Tg及Ts温度更低的玻璃,同时耐水性也有所提高。对玻璃膨胀系数(α)的影响依次为K2O>Na2O>Li2O,且随R2O含量的增加而增加。此外混合碱效应对α的变化无明显影响。Structure and properties of zinc antimony phosphate glasses containing alkali metal oxides R2O （R = Li, Na, K） were investigated by using IR spectra, DTA, etc. The results revealed that there was no noticeable distinction in glass network structure amongst the glasses containing different kinds of R2O- But the addition of K2O increased glass transition temperature Tg, softening temperature Ts, crystallization capability and water durability remarkably. Glass network structure was weakened by substitution of R2O for ZnO, resulting in a decrease in Tg and Ts temperatures, water durability, and an increase in crystallization tendency. A typical mixed alkali effect by appropriate adjustment of the molar ratio Li2O / （Li2O ＋ Na2O）, which resulted in a lowest Tg and Ts and a best water durability, was observed. The tendency to increase coefficient of thermal expansion （α） , which was proportional to the total amount of R2O, was ranged as K2O〉 Na2O 〉 Li2O, and no mixed alkali effect on α was observed.

关 键 词：磷酸盐低熔玻璃 碱金属氧化物 软化温度 耐水性 

分 类 号：TQ171.737[化学工程—玻璃工业]