本文選題：ZnO壓敏電阻 + 電性能　； 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：ZnO壓敏電阻器由于其優(yōu)良的非線性特性和強(qiáng)耐浪涌能力，被用來對(duì)各種電力系統(tǒng)和電子線路進(jìn)行過電壓保護(hù)。如今，隨著電力系統(tǒng)及電子線路的快速發(fā)展，對(duì)ZnO壓敏電阻材料的安全可靠性以及體積的小型化等方面提出了更高的要求，因此制備出高性能的ZnO壓敏電阻材料是目前的主要研究熱點(diǎn)。而ZnO壓敏電阻材料的性能在很大程度上由原料的性質(zhì)、配方成份和制備工藝決定，為了制備出綜合性能優(yōu)良的ZnO壓敏電阻材料，本文研究了ZnO壓敏電阻制備過程對(duì)其電性能的影響，并對(duì)制備過程進(jìn)行優(yōu)化。主要研究?jī)?nèi)容和研究結(jié)果如下： 1、研究了聚丙烯酸銨分散劑量和球磨時(shí)間對(duì)ZnO壓敏電阻材料電性能的影響。研究表明，適量的聚丙烯酸銨分散劑配合適當(dāng)?shù)那蚰r(shí)間可有效提高ZnO粉體與添加劑的球磨混合效率，改善ZnO壓敏電阻材料的小電流特性和大電流特性。 2、研究了ZnO壓敏電阻的排膠熱過程及排膠工藝對(duì)ZnO壓敏電阻電性能的影響。研究表明，ZnO壓敏電阻用粉料中殘留自由水的揮發(fā)溫度區(qū)間為室溫至150℃，聚乙烯醇粘合劑的分解、揮發(fā)溫度區(qū)間主要為200~350℃，Sb2O3發(fā)生氧化反應(yīng)的溫度區(qū)間為500~600℃，且Sb2O3的氧化會(huì)引起較大的體積收縮。合理的排膠過程能減少材料耗盡層中氧空位缺陷的存在，降低施主濃度，使得晶界勢(shì)壘高度增加，從而提高材料的非線性系數(shù)，，同時(shí)，排膠能提高材料的致密性和結(jié)構(gòu)均勻性，減小材料的漏電流，提高材料的耐脈沖電流特性。 3、研究了不同壓敏電壓梯度ZnO壓敏電阻材料的燒結(jié)熱過程及燒結(jié)工藝對(duì)ZnO壓敏電阻電性能的影響。研究表明，壓敏陶瓷材料因配方成分不同燒結(jié)熱過程差異較大，材料的液相形成溫度及致密度隨Sb2O3含量的減少及TiO2含量的增多而降低，且燒結(jié)溫度超過1150℃時(shí)，不同組成的ZnO壓敏陶瓷材料的Bi2O3相都會(huì)加劇揮發(fā)。實(shí)驗(yàn)還發(fā)現(xiàn)，燒結(jié)工藝對(duì)ZnO壓敏電阻材料的電性能影響很大，壓敏電壓梯度會(huì)隨著燒結(jié)溫度升高或保溫時(shí)間的延長(zhǎng)而逐漸降低，但從其他特性測(cè)試結(jié)果發(fā)現(xiàn)，對(duì)特定配方材料可試驗(yàn)得出最佳燒結(jié)條件，在此燒結(jié)條件下可獲得較佳電性能，燒結(jié)條件不合適會(huì)使漏電流增大，非線性特性及耐脈沖電流特性變差。
[Abstract]:Due to its excellent nonlinear characteristics and strong surge resistance, ZnO varistor is used to protect all kinds of power systems and electronic circuits. Now, with the rapid development of power systems and electronic circuits, the safety and reliability of ZnO varistor materials and the miniaturization of volume are higher requirements. The preparation of high performance ZnO varistor material is the main hot spot at present, and the performance of ZnO varistor material is largely determined by the properties of raw materials, composition and preparation process. In order to prepare the ZnO varistor material with excellent comprehensive properties, this paper studied the electrical properties of the ZnO varistor preparation process. The main research contents and results are as follows:
1, the influence of the dispersing dose of ammonium polyacrylate and the ball milling time on the electrical properties of the ZnO varistor is studied. The study shows that a proper amount of ammonium polyacrylate dispersing agent with the appropriate ball milling time can effectively improve the mixing efficiency of the ball milling of the ZnO powder and the additive, and improve the small current characteristic and the large current characteristic of the ZnO varistor material.
2, the influence of the heat process of ZnO varistor and the process of sizing on the electrical properties of ZnO varistor is studied. The study shows that the evaporation temperature range of the residual free water in the ZnO varistor is from room temperature to 150 C, the decomposition of the polyvinyl alcohol adhesive, the temperature range of the volatilization temperature is mainly at 200~350 C, and the temperature range of the oxidation reaction of Sb2O3 occurs. At 500~600 C, the oxidation of Sb2O3 causes large volume contraction. The rational process of sizing can reduce the existence of oxygen vacancy in the material depletion, reduce the concentration of the donor, increase the height of the grain boundary barrier, and increase the nonlinear coefficient of the material, at the same time, the compactness and structure uniformity of the material can be raised and the material leakage can be reduced. Current, improve the pulse current resistance of the material.
3, the influence of the sintering heat process and the sintering process on the electrical properties of ZnO varistor with different voltage sensitive voltage gradient ZnO varistor materials is studied. The study shows that the different sintering heat processes of the varistor ceramic materials are different, the liquid phase forming temperature and density of the material are reduced with the decrease of Sb2O3 content and the increase of the TiO2 content. When the sintering temperature is more than 1150 C, the Bi2O3 phase of the ZnO varistor ceramics with different composition will aggravate the volatilization. It is also found that the sintering process has a great influence on the electrical properties of the ZnO varistor material, and the voltage gradient will gradually decrease with the increase of the sintering temperature or the prolongation of the heat preservation time, but it is found from the test results of other characteristics. The optimum sintering conditions can be obtained for the specific formula materials. Under the sintering conditions, the better electrical properties can be obtained. The leakage current will be increased and the nonlinear characteristics and pulse current characteristics are worse.

【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM54

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

1 盧振亞;氧化物壓敏陶瓷晶界特性與宏觀電性能的關(guān)系[D];華南理工大學(xué);2012年

本文編號(hào)：1895799