本文選題：ZnO功率電阻 + 能量密度　； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：ZnO脈沖功率電阻具有功率容量大、I-V特性線性度好、電阻溫度系數(shù)小、電阻率可調(diào)、成本低等優(yōu)越性能,主要用于電力系統(tǒng)的中性點(diǎn)接觸電阻、斷路器分合閘電阻、發(fā)動(dòng)機(jī)滅磁電阻等。本文對(duì)單獨(dú)摻Al的ZnO功率電阻的歐姆電極材料、燒結(jié)工藝、材料配方及耐高能脈沖沖擊能力進(jìn)行系統(tǒng)的研究。主要研究?jī)?nèi)容和結(jié)論如下:1.分別研究了含鋅銀漿電極、金屬Al電極和Ti/Au合金電極對(duì)摻Al的ZnO功率電阻的影響。實(shí)驗(yàn)結(jié)果表明,在N2氣氛中燒結(jié)含鋅銀漿電極,能有效降低電極與ZnO接觸電阻;在摻Al的ZnO陶瓷表面濺射一層Al電極經(jīng)退火處理后能形成歐姆接觸,300℃退火時(shí),電阻率為3.94Ω·cm,但Al在空氣中易氧化電極表面形成一層薄的氧化層,增加附加的電阻;在摻Al的ZnO陶瓷表面濺射一層Ti/Au合金電極能形成良好歐姆接觸,經(jīng)400℃退火時(shí)電阻率為0.503Ω·cm。2.研究了單獨(dú)摻雜Al(NO3)3·9H2O含量對(duì)ZnO線性電阻顯微結(jié)構(gòu)和電學(xué)性能的影響。實(shí)驗(yàn)結(jié)果表明,單獨(dú)摻雜Al(NO3)3·9H2O的ZnO線性電阻性能比單獨(dú)摻雜Al2O3的性能好,在摻雜含量為8mol%范圍內(nèi),電阻率為0.79~22.89Ω·cm,非線性系數(shù)小于1.2,電阻溫度系數(shù)為-1.0x10-3~-2.2x10-3/℃,進(jìn)行20μs脈沖波強(qiáng)電流下耐受沖擊能力測(cè)試,所能承受的能量密度達(dá)1000J/cm3,沖擊測(cè)試后試樣阻值降幅在5%內(nèi)。3.探索性研究了LSCO(La0.5Sr0.5CoO3)陶瓷電阻的電學(xué)性能,以及燒結(jié)溫度對(duì)LSCO陶瓷性能影響。實(shí)驗(yàn)結(jié)果表明,在1240℃~1300℃范圍內(nèi),隨著燒結(jié)溫度增加,LSCO陶瓷密度先增大后減小;燒結(jié)溫度在1270℃時(shí),LSCO陶瓷密度6.250g/cm3,電阻率為0.5Ω·cm,非線性系數(shù)1.04,電阻溫度系數(shù)-3.33x10-3/℃;將LSCO電阻試樣進(jìn)行貼銅片和環(huán)氧樹(shù)脂封裝,進(jìn)行脈沖寬度20μs的高能強(qiáng)電流沖擊,測(cè)試結(jié)果表明LSCO陶瓷電阻能承受高能量沖擊,可承受住8000 J/cm3以上的能量密度的沖擊,但在高壓強(qiáng)電流沖擊后,銀電極與LSCO陶瓷接觸不良,致使LSCO陶瓷電阻試樣的電阻阻值大幅度增大。最后,結(jié)合實(shí)際應(yīng)用,研究了運(yùn)用ZnO+1.5mol%Al2O3材料配方制備尺寸為Φ125x10.5mm的ZnO功率電阻,對(duì)制備出的試樣焊接銅片和用環(huán)氧樹(shù)脂封裝,最后用8.7ms脈沖波強(qiáng)電流進(jìn)行耐沖擊測(cè)試。實(shí)驗(yàn)結(jié)果表明,經(jīng)正反各5次測(cè)試后,試樣完整無(wú)損,功率容量達(dá)4.17kJ,達(dá)到了功率容量大于3.4kJ的應(yīng)用要求。
[Abstract]:ZnO pulse power resistance has many advantages, such as high power capacity, good linearity of I-V characteristics, low temperature coefficient, adjustable resistivity and low cost. It is mainly used in neutral contact resistance of power system and switch resistance of circuit breaker.Engine demagnetization resistance, etc.In this paper, the ohmic electrode materials, sintering process, material formulation and high energy impulse impact resistance of ZnO power resistor alone doped with Al are systematically studied.The main contents and conclusions are as follows: 1.The effects of Zn-Ag paste electrode, Al electrode and Ti/Au alloy electrode on the power resistance of Al-doped ZnO were studied.The experimental results show that the contact resistance between the electrode and ZnO can be effectively reduced by sintering zinc containing silver paste electrode in N2 atmosphere, and when Al doped ZnO ceramic surface sputtering layer Al electrode is annealed, ohmic contact can be formed at 300 鈩，

本文編號(hào)：1770183