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研究生:陳學文
研究生(外文):Chen, Hsueh-Wen
論文名稱:以溶膠-凝膠法製備堇青石-鈣斜長石玻璃陶瓷基板材料
論文名稱(外文):The Preparation of Cordierite-Anorthite Glass Ceramics by Sol- Gel Methods
指導教授:魏萬益, 吳溪煌
指導教授(外文):Wan-Yi Wei, She-Huang Wu
學位類別:碩士
校院名稱:大同工學院
系所名稱:材料工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:1996
畢業學年度:84
語文別:中文
論文頁數:138
中文關鍵詞:溶膠-凝膠法堇青石鈣斜長石
外文關鍵詞:sol-gelcordieriteanorthite
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本研究以溶膠-凝膠法製備化學計量比堇青石及鈣斜長石成份之玻璃粉
末,探討B2O3、P2O5對這兩種粉末的結晶行為及介電性質影響。實驗發現
,於化學計量比之堇青石中添加B2O3及P2O5會促進α-cordierite結晶的
生成, 且P2O5會增加燒結體的緻密性;但B2O3、P2O5對堇青石之介電常
數、Loss tangent的影響則不顯著。若將B2O3、P2O5添加於計量比的鈣斜
長石中,則B2O3會促進鈣斜長石的triclinic相生成,但P2O5則無明顯影
響;兩者的添加均會使燒結體的密度、介電常數隨添加量的增加而下降。
此外,本研究也以溶膠-凝膠法製備MgO:Al2O3:SiO2=25:22:53之堇青
石及化學計量比之鈣斜長石粉末,並將二種粉末以不同重量百分比混合,
燒結成堇青石-鈣斜長石之玻璃陶瓷。同時,也以溶膠-凝膠法製得相同組
成之Ca-Mg-Al-Si四成份粉末,燒結成堇青石-鈣斜長石之玻璃陶瓷,以比
較兩種製程所得玻璃陶瓷性質之異同。由粉末混合或直接溶膠凝膠法所得
結果均顯示堇青石會促進鈣斜長石的triclinic相析出,而鈣斜長石亦會
促進堇青石的α-cordierite相析出。由SEM的觀察及EDS測量發現,在富
鈣斜長石的試片中,有鈣斜長石球狀組織,其周圍則為堇青石,兩者間有
良好的潤濕性,使堇青石-鈣斜長石玻璃陶瓷具有良好的燒結特性。若以
直接溶膠凝膠法製備的堇青石-鈣斜長石玻璃陶瓷,由於混合程度均勻,
故試片的特性與組成間的關係較具規則性;其密度在2.2∼2.7間,介電常
數(5.4∼7.0)隨鈣斜長石的百分比增加而成線性增加;當鈣斜長石的添加
量為20wt%∼60wt%時,有較低之熱膨脹係數,其值在100℃時為4.0
∼4.5×10-6,在200℃時為2.5∼4.0×10-6。



The effects of B2O3 and P2O5 on the crystallization behavior and
dielectric properties of sol-

gel prepared stoichiometric cordierite and anorthite were
studied. From the results, it was

found that both B2O3 and P2O5 in the cordierite would promote
the formation of α- cordierite. And the addition
of P2O5 could also cause the densification of cordierite.
However, these additions had little influences on the dielectric
constant and loss tangent of stoichiometric cordierite.
Contrastingly, only the additions of B2O3 to the stoichiometric
anorthite promoted the formation of the triclinic phase.
Addition of P2O5 did not affect the crystallization of
anorthite. Both bulk densities and the dielectric constants of
sintered anorthite decreased with the increase of B2O3 and P2
O5. In addition, gel-
derived cordierite glass powder with composition of
MgO/Al2O3/SiO2=25/22/53 were prepared and mixed with gel-derived
stoichiometric anorthite glass powder with
various weight percentages and sintered to form cordierite-
anorthite composites. Composites of the same compositions were
also prepared by sol-gel of Ca-Mg-Al-Si four components
system. In these composites, it was found that cordierite
could promote the formation of the triclinic phase of anorthite
and anorthite could enhance the formation of α-cordierite
regardless of the preparation method. SEM and EDS analyses
showed that spherical anorthite were surrounded by cordierite in
the anorthite-rich samples. The wetting between anorthite and
cordierite appeared to be good. This would result in good
sinterability in the cordierite-anorthite system. The samples
prepared by sol-gel process howshow better relationships
between properties and compositions than those by powder mixing
process. The densities of the cordierite-anorthite glass
ceramics prepared by sol-gel process were between 2.2 and 2.7 g/
cm3, and the dielectric constants (5.4∼7.0) lineally increased
with the weight percentage of the anorthite. When cordierite-
anorthite glass ceramics contained 20 to 60wt% of
anorthite, the samples showed low thermal expansion
coefficients:4.0∼4.5×10-6/℃ at 100℃, and 2.5∼4.0×10-6/℃
at 200℃.

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