需要金幣： 1000 個金幣 |
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| 折扣與優(yōu)惠：團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:本實驗以水合硝酸鎂、水合硝酸鋁和硅酸為原料，尿素為燃料，硝酸銨為燃燒助劑，用低溫燃燒法簡便快捷地合成了堇青石前驅(qū)粉(MgO-Al2O3-SiO2)。在不同粒徑的堇青石前驅(qū)粉中加入適量的粘結(jié)劑和復(fù)合添加劑(2.5%B2O3+5%Bi2O3 +2.5%P2O5)，把粉體在170MPa下干壓成片, 于不同溫度下燒結(jié)獲得堇青石基玻璃陶瓷。 用排水法測量燒結(jié)體的密度，研究粒徑對摻雜硼磷鉍堇青石粉燒結(jié)性能的影響；通過x-射線衍射分析樣品的物相，研究粒徑對摻雜硼磷鉍堇青石粉析晶性能的影響。實驗結(jié)果如下： （1）以Mg(NO3)2·6H2O, Al(NO3)3·9H2O和H2SiO3為原料，CO(NH2)2為燃料，可用低溫燃燒法制備堇青石基玻璃陶瓷。 ?。?）本實驗制備堇青石基玻璃陶瓷的析晶過程為：非晶態(tài)→μ-堇青石相→α-堇青石相。 ?。?）復(fù)合添加劑(2.5% B2O3+ 2.5%P2O5 + 5% Bi2O3)明顯促進μ-堇青石向α-堇青石的相轉(zhuǎn)變或促進α-堇青石相直接析晶。 （4）加入復(fù)合添加劑(2.5% B2O3+ 2.5%P2O5 + 5% Bi2O3)在950℃左右即可獲得較高純度的α-堇青石。 （5）小粒徑粉體有助于α-堇青石相低溫析晶，也有助于堇青石的低溫?zé)Y(jié)。 關(guān)鍵詞：粒徑；添加劑；低溫燃燒；堇青石；性能
Abstract:The MgO-Al2O3-SiO2( MAS ) glass powder have been synthesized by low-temperature combustion technique using magnesium nitrate, aluminium nitrate, silicic acid as material, sucrose or urea as fuel. Put into right amount of binder and additives, pigeonhole in flakes under 170Mpa, frit and obtain base glass ceramics of cordierite at different temperature. Measuring and sritting the density of the body with the law of water drainage, studying particle size to burning and formating cordierites powder contains right amount of additive BPBi to frit on the influence of performance at low temperature; analyzing the thing looks of the sample through x-ray diffraction, study the influence that the particle size analyses brilliant performance to the cordierite contains right amount of additive BPBi. Experimental results are as follows: (1) Cordierite-based glass-ceramics have been synthesized by low-temperature combustion technique using magnesium nitrate, aluminium nitrate, silicic acid as material and urea as fuel. (2) the brilliant process of a little brilliant glass of cordierite is a non- brilliant attitude →μ-cordierite →α-cordierite; (3) compound additives(2.5%B2O3+2.5%P2O5+5%Bi2O3) can obviously promote the transformation from μ-cordierite to α–cordierite or promote the transformation from glass to α – cordierite directly. (4) adding compound additive(2.5%B2O3+2.5%P2O5+5%Bi2O3) can obtain high purity α-cordierite ceramics at 950℃. (5) Small size powder help α-cordierite crystallization, also conduce to the cordierite sintering in a low-temperature. Key words: size; additives; low-temperature combustion; cordierite; performance |
