【摘要】：多層片式元件由于其小體積、高性能、適合于表面貼裝等優(yōu)點(diǎn)被廣泛應(yīng)用,其中多層片式熱敏電阻與多層片式壓敏電阻經(jīng)常同時(shí)作為電路保護(hù)元件使用,將二者復(fù)合具有現(xiàn)實(shí)意義。內(nèi)電極是多層片式熱/壓敏元件的重要組成部分,若使用賤金屬鎳為內(nèi)電極可大大降低成本。以鎳作為內(nèi)電極需有三個(gè)難題需解決。首先,鎳的氧化;其次,鎳與瓷體的收縮匹配;最后,內(nèi)電極與瓷體界面之間的互滲與反應(yīng)。本文對(duì)鎳表面進(jìn)行了改性,用化學(xué)法合成Ni/BaTiO3復(fù)合粉體及Ni/ZnO復(fù)合粉體,復(fù)合粉體兩相均勻混合,為BaTiO3或ZnO包覆鎳結(jié)構(gòu)。一則粉體的抗氧化性提高;二則由于包覆層為瓷體材料,一方面使復(fù)合粉體與瓷體收縮匹配,另一方面不影響瓷體的性能。如此獲得的復(fù)合粉體用作多層片式熱/壓敏元件內(nèi)電極的導(dǎo)電相。首先,分別采用水熱沉淀法與水熱結(jié)晶法合成了Ni/BaTiO3與Ni/Zn O復(fù)合粉體,并對(duì)合成過(guò)程中影響復(fù)合粉體結(jié)構(gòu)和相組成的反應(yīng)條件如鎳粉預(yù)處理、水解調(diào)節(jié)劑濃度等進(jìn)行研究,制備出相純凈、抗氧化性能提高、收縮性得到改善的復(fù)合粉體。其次,用復(fù)合粉體合成了相應(yīng)的電極漿料。對(duì)漿料的導(dǎo)電性、燒結(jié)特性等進(jìn)行了研究。又將復(fù)合粉體漿料應(yīng)用于瓷體,研究了漿料與瓷體的匹配共燒性能。復(fù)合粉體電極漿料能燒結(jié)成膜且導(dǎo)電性滿足使用要求。Ni/BaTiO3電極漿料的收縮性與瓷體相匹配,且與瓷體共燒時(shí)未出現(xiàn)分層等缺陷。
[Abstract]:Multilayer chip components are widely used for their small volume and high performance, which are suitable for surface mount, among which multilayer thermistors and multilayer varistors are often used as circuit protection elements. It is of practical significance to compound the two. The internal electrode is an important part of the multilayer thermal / varistor. If the base metal nickel is used as the internal electrode, the cost can be greatly reduced. Using nickel as an internal electrode requires three problems to be solved. Firstly, the oxidation of nickel; secondly, the shrinkage match between nickel and porcelain; finally, the mutual permeation and reaction between internal electrode and porcelain. In this paper, the surface of nickel was modified. Ni/BaTiO3 composite powder and Ni/ZnO composite powder were synthesized by chemical method. The composite powder was uniformly mixed in two phases, and the nickel structure was coated with BaTiO3 or ZnO. In one case, the oxidation resistance of the powder is improved; second, because the coating layer is porcelain material, on the one hand, the composite powder is matched with the ceramic body, on the other hand, the properties of the ceramic body are not affected. The composite powder can be used as the conductive phase of the inner electrode of the multilayer thermal / pressure sensitive element. Firstly, Ni/BaTiO3 and Ni/Zn O composite powders were synthesized by hydrothermal precipitation method and hydrothermal crystallization method respectively. The reaction conditions such as pretreatment of nickel powder and concentration of hydrolytic modifier were studied. The composite powders with pure phase, improved oxidation resistance and better shrinkage were prepared. Secondly, the corresponding electrode paste was synthesized from the composite powder. The electric conductivity and sintering characteristics of slurry were studied. The composite powder paste was applied to the ceramic body, and the matching co-firing property between the paste and the ceramic body was studied. The composite powder electrode paste can be sintered to form a film and the electrical conductivity meets the requirements of the application. The shrinkage of the composite powder electrode paste matches the ceramic body and there are no delamination when the composite powder electrode paste is co-fired with the ceramic body.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.3

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