發(fā)布時(shí)間：2017-12-27 03:15

  本文關(guān)鍵詞：95氧化鋁陶瓷直流擊穿強(qiáng)度影響因素的研究　出處：《華南理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 直流擊穿強(qiáng)度 體積密度 介電損耗 晶粒粒徑 擊穿方式

【摘要】：隨著我國西電東送以及高鐵網(wǎng)絡(luò)的跨越式發(fā)展,超高壓真空管殼的需求量大幅提升,但是我國真空管殼的性能與國外的先進(jìn)水平差距較大,主要體現(xiàn)在兩方面:一是直流擊穿強(qiáng)度較低,國內(nèi)先進(jìn)水平達(dá)到32.9kV/mm左右,而國外先進(jìn)水平可達(dá)45kV/mm以上;二是燒成溫度偏高,國內(nèi)真空管殼生產(chǎn)主要是在空氣氣氛下燒成,燒成溫度一般在1680℃,能耗較高,國外先進(jìn)的企業(yè)已經(jīng)開始嘗試結(jié)合配方的創(chuàng)新,并采用特種燒結(jié)方式,燒成溫度可降低150℃左右。上述兩個原因?qū)е铝宋覈娬婵展軞な褂昧康?0%以上需要進(jìn)口,其中超高壓管殼全部依賴進(jìn)口。超高壓真空管殼是一種95氧化鋁陶瓷材料,為了提高超高壓真空管殼的直流擊強(qiáng)度,降低其燒結(jié)溫度,本文分兩部分進(jìn)行實(shí)驗(yàn)研究。第一部分是研究液相燒結(jié)助劑、燒成溫度和氧化鋁種類對95氧化鋁陶瓷結(jié)構(gòu)和性能的影響,通過正交實(shí)驗(yàn)分析法得出液相燒結(jié)助劑的最優(yōu)水平為CaCO3+SiO2。為了進(jìn)一步提高95氧化鋁陶瓷的直流擊穿強(qiáng)度,本文第二部分實(shí)驗(yàn)以CaCO3+SiO2作為液相燒結(jié)助劑,通過正交實(shí)驗(yàn)的方法研究了固相燒結(jié)助劑摻雜對95氧化鋁陶瓷結(jié)構(gòu)和性能的影響,結(jié)果發(fā)現(xiàn)以工業(yè)Al2O3為原料,摻雜質(zhì)量分?jǐn)?shù)分別為4.90%,0.77%,0.45%,0.30%和0.75%的SiO2,CaCO3,MgO,ZrO2和CeO2,并在1630℃下燒成出來的95氧化鋁陶瓷的直流擊穿強(qiáng)度達(dá)到57.6kV/mm,高于國外先進(jìn)水平。通過對實(shí)驗(yàn)結(jié)果分析發(fā)現(xiàn)晶粒粒徑(包括晶粒平均粒徑和大晶粒粒徑)決定陶瓷的擊穿方式,體積密度、介電損耗和擊穿方式共同影響直流擊穿強(qiáng)度的大小。擊穿方式僅為熱擊穿的陶瓷樣品擊穿強(qiáng)度較大。為了形成熱擊穿,晶粒平均粒徑和大晶粒粒徑均不能太大。為了提高擊穿方式為熱擊穿的陶瓷的直流擊穿強(qiáng)度,在其體積密度達(dá)到一定時(shí),應(yīng)優(yōu)先降低其介電損耗。
[Abstract]:Along with our country from west to East and leap type development of high-speed rail network, demand for ultra high vacuum tubes increased significantly, but the performance of China and the international advanced level of vacuum tubes of the larger gap, mainly reflected in two aspects: one is the DC breakdown strength is low, the domestic advanced level and reach about 32.9kV/mm. The advanced level is up to 45kV/mm; two burning temperature is high, the domestic production of vacuum tube shell is sintered in air atmosphere, sintering temperature at 1680 DEG C, higher energy consumption, advanced foreign enterprises have begun to try to combine innovation with the party, and the special sintering, the sintering temperature can be reduced by 150 deg. The above two reasons lead to the import of more than 30% of the use of electric vacuum tube and shell in China, of which the ultra high pressure pipe shell all depends on the import. The ultra-high pressure vacuum shell is a 95 alumina ceramic material. In order to improve the DC impact strength and reduce the sintering temperature of the ultra-high pressure vacuum shell, this paper is divided into two parts for experimental research. The first part is the study of liquid phase sintering additives, sintering temperature and the effect of alumina species on the structure and properties of 95 alumina ceramics, through the analysis of orthogonal test method of optimal level of liquid phase sintering additives for CaCO3+SiO2. In order to further improve the DC breakdown strength of 95 alumina ceramics, the second part of this experiment using CaCO3+SiO2 as a liquid phase sintering aid, through the method of orthogonal experiment on the effect of solid phase sintering aids doped on structure and properties of 95 alumina ceramics, found in industrial Al2O3 as raw materials. The doping concentration was 4.90%, respectively, 0.77%, 0.45%, SiO2 0.30% and 0.75%, CaCO3, MgO, ZrO2 and CeO2, DC breakdown strength and firing out at 1630 DEG C of 95 alumina ceramics reached 57.6kV/mm, higher than the international advanced level. Through the analysis of the experimental results, it is found that grain size (including the average grain size and large grain size) determines the way of ceramic breakdown, and the volume density, dielectric loss and breakdown mode affect the DC breakdown strength. The breakdown strength of ceramic samples with a breakdown only for thermal breakdown is larger. In order to form thermal breakdown, the average grain size and grain size of the grain can not be too large. In order to improve the DC breakdown strength of the ceramic with the breakdown mode for thermal breakdown, the dielectric loss should be reduced first when the volume density reaches a certain extent.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TQ174.1

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本文編號：1340013