本文選題：微波介質(zhì)陶瓷 + 鎢酸鹽��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：微波介質(zhì)陶瓷作為一種代表性的應(yīng)用型高技術(shù)材料在近些年得到了廣泛的研究。憑借著優(yōu)良的介電性能,低溫共燒陶瓷(LTCC)在近些年來也得到了廣泛的關(guān)注。鎢酸鹽類陶瓷作為一種典型的低溫共燒陶瓷,也被大家所重視起來。本文主要是通過固相反應(yīng)法制備鎢酸鹽類微波介質(zhì)陶瓷,對陶瓷樣品的結(jié)構(gòu)和介電性能做了初步的研究,并使用Materials Studio(MS)軟件成功優(yōu)化得出了鎢酸鹽化合物的晶體結(jié)構(gòu),將計算得到的XRD圖譜與實驗測試所得到的進行比對,結(jié)果趨于一致,為進一步的理論研究奠定了良好的基礎(chǔ)。(1)根據(jù)設(shè)計的實驗工藝條件成功的制備了AWO4(A=Zn,Mg,Co,Ni)微波介質(zhì)陶瓷,分析了AWO4陶瓷樣品的物相組成,微觀結(jié)構(gòu)以及微波介電性能。研究分析了不同的燒結(jié)溫度對于AWO4微波介質(zhì)陶瓷致密度以及介電性能的影響。XRD測試結(jié)果表明其與標準卡片ICDD-PDF#88-0251的衍射峰相對應(yīng),在圖譜中并沒有其它的衍射峰。隨著燒結(jié)溫度的增高,AWO4微波介質(zhì)陶瓷的體積密度、介電常數(shù)以及品質(zhì)因數(shù)有著大致相同的規(guī)律,總體上隨著燒結(jié)溫度的升高呈上升趨勢;在此次實驗工藝條件下制備的四類AWO4微波介質(zhì)陶瓷樣品中,性能較好的是Zn WO4陶瓷,它在1150℃的溫度下燒結(jié)時,密度可以達到6.981g/cm3,其微波介電性能為:(28)33.15r?,Q×?=38300GHz,-(28)1.14f?ppm/℃;(2)通過加入四種不同質(zhì)量比例的Cu O降低陶瓷樣品的燒結(jié)溫度,提高陶瓷樣品的致密度。樣品表面XRD測試結(jié)果中的衍射峰仍與標準卡ICDD-PDF#88-0251的衍射峰相對應(yīng),表明無第二相產(chǎn)生。微波介電性能測試結(jié)果顯示,隨著燒結(jié)溫度的增加,陶瓷樣品的體積密度和介電常數(shù)仍然呈上升趨勢,但在一定程度上降低了陶瓷樣品的品質(zhì)因數(shù);對于相同燒結(jié)溫度下陶瓷樣品,Cu O的摻雜比例越高,致密度和介電常數(shù)的增加越明顯,其中Zn WO4-1wt%Cu O陶瓷樣品在1100℃下燒結(jié)時(28)10.15r?,Q×?=4398GHz,-(28)5.11f?ppm/℃;(3)AWO4(A=Zn,Mg,Co,Ni)均為單斜相的黑鎢礦結(jié)構(gòu),通過MS軟件優(yōu)化得到了AWO4化合物的晶體結(jié)構(gòu),進一步得出了其XRD理論計算圖譜,并通過與樣品測試得到的圖譜對比分析我們可以發(fā)現(xiàn)兩者的契合度很高,為進一步的理論研究做好了鋪墊。
[Abstract]:Microwave dielectric ceramics as a representative of the application of high-tech materials have been widely studied in recent years. Due to its excellent dielectric properties, low-temperature co-fired ceramics (LTCCs) have been paid more and more attention in recent years. As a typical low-temperature co-fired ceramics, tungstate ceramics have been paid more attention to. In this paper, tungstate microwave dielectric ceramics were prepared by solid state reaction method. The structure and dielectric properties of ceramic samples were preliminarily studied, and the crystal structure of tungstate compounds was successfully optimized by using Materials Studio MSM software. Comparing the calculated XRD patterns with the experimental results, the results are consistent, which lays a good foundation for further theoretical research. According to the experimental conditions designed, the AWO _ 4O _ 4 AZN _ (Zn) mg _ (Co) Ni) microwave dielectric ceramics have been successfully prepared. The phase composition, microstructure and microwave dielectric properties of AWO _ 4 ceramics were analyzed. The effect of sintering temperature on the density and dielectric properties of AWO _ 4 microwave dielectric ceramics was investigated. XRD results showed that it corresponded to the diffraction peak of standard card ICDD-PDF #88-0251, and there were no other diffraction peaks in the spectrum. With the increase of sintering temperature, the bulk density, dielectric constant and quality factor of AWO4 microwave dielectric ceramics are approximately the same. Among the four kinds of AWO _ 4 microwave dielectric ceramic samples prepared under the experimental conditions, the Zn-WO _ 4 ceramics have better properties, and they are sintered at 1150 鈩，

本文編號：1997413