發(fā)布時(shí)間：2018-06-06 16:57

  本文選題：電觸頭材料 + 機(jī)械合金化　； 參考：《暨南大學(xué)》2010年碩士論文

【摘要】： 電觸頭主要負(fù)責(zé)接通、斷開(kāi)電路及負(fù)載電流的任務(wù),由于它的特殊作用,電接觸材料的性能直接影響電子產(chǎn)品的可靠性、穩(wěn)定性、精度和使用壽命。在閉合和斷開(kāi)的過(guò)程中觸頭受到電侵蝕是導(dǎo)致其不能正常工作的主要原因。因此開(kāi)展抗電侵蝕性能強(qiáng)的電接觸材料的研究有重要的意義。 本文主要研究機(jī)械合金化法制備AgCr觸頭材料及其性能。首先,分析球磨轉(zhuǎn)速和球磨時(shí)間對(duì)球磨粉末物相、晶粒大小、微觀應(yīng)變和粉末形貌的影響,主要是用X射線衍射儀和掃描電子顯微鏡對(duì)粉末進(jìn)行物相及形貌分析。其次,研究球磨轉(zhuǎn)速、球磨時(shí)間、球料比和燒結(jié)溫度等工藝參數(shù)對(duì)AgCr合金材料的密度、硬度、導(dǎo)電性、金相結(jié)構(gòu)的影響,總結(jié)出制備性能優(yōu)異的AgCr合金材料的工藝。最后,通過(guò)對(duì)電路電流及通斷比的變化、觸頭接觸電阻的變化和接觸表面形貌及成分的分析研究,可綜合分析觸頭材料的電接觸性能。通過(guò)比較AgCr觸頭、銅基覆銀觸頭、AgSnO2觸頭在電流作用下的接觸性能,檢驗(yàn)AgCr觸頭是否具有較強(qiáng)的抗電侵蝕能力。 研究結(jié)果表明：當(dāng)球磨轉(zhuǎn)速達(dá)到一定值,球磨到一定時(shí)間,Cr相能部分固溶到Ag相中。適當(dāng)?shù)那蚰スに噮?shù)和燒結(jié)溫度可以制備出性能相對(duì)優(yōu)異的AgCr合金,其制備的AgCr(Cr含量12 wt%),密度為9.62 g／cm3,硬度為122.3 HV,導(dǎo)電率4.03μΩ·cm,同時(shí)燒結(jié)體金相結(jié)構(gòu)表明該工藝參數(shù)下制備的觸頭材料組織分散較均勻,無(wú)明顯團(tuán)聚現(xiàn)象,具有很好的開(kāi)發(fā)和應(yīng)用前景。 AgCr觸頭電接觸性能分析表明：分別在相同測(cè)試條件下,發(fā)現(xiàn)AgCr觸頭電性能要優(yōu)于銅基覆銀觸頭；而與AgSnO2觸頭相比,AgCr對(duì)稱觸頭材料轉(zhuǎn)移量更大,但是AgSnO2觸頭接觸表面有裂紋生成,并且閉合分?jǐn)嚯娏鬟_(dá)10萬(wàn)次后,AgCr對(duì)稱觸頭保持接觸電阻低而穩(wěn)定,同時(shí)電路通斷比沒(méi)變化�？傮w評(píng)價(jià)：AgCr觸頭具有較好的電接觸性能。
[Abstract]:The electrical contact is mainly responsible for the task of turning on, disconnecting circuit and load current. Because of its special function, the performance of electrical contact material directly affects the reliability, stability, precision and service life of electronic products. Electrical erosion of the contact during closure and disconnection is the main cause of its failure to work properly. Therefore, it is of great significance to study the electrical contact materials with strong resistance to electrical erosion. In this paper, the preparation and properties of AgCr contact materials by mechanical alloying are studied. Firstly, the effects of ball milling speed and milling time on the phase, grain size, micro strain and powder morphology of ball milling powder were analyzed. The phase and morphology of the powder were analyzed by X-ray diffractometer and scanning electron microscope. Secondly, the effects of milling speed, milling time, ratio of ball to material and sintering temperature on the density, hardness, electrical conductivity and metallographic structure of AgCr alloy were studied, and the process of preparing AgCr alloy with excellent properties was summarized. Finally, the electrical contact properties of the contact materials can be comprehensively analyzed by analyzing the changes of the circuit current, the on-off ratio, the contact resistance, the morphology and the composition of the contact surface. By comparing the contact properties of AgCr contacts and copper based silver coated contacts with AgSnO2 contacts under the action of electric current, the results show that the AgCr contacts have strong resistance to electric erosion. The results show that when the ball milling speed reaches a certain value, The Cr phase energy is partially dissolved into Ag phase by ball milling to a certain time. AgCr alloys with relatively excellent properties can be prepared by proper ball milling process parameters and sintering temperature. The AgCr-Cr content is 12 wtlong, the density is 9.62 g / cm ~ 3, the hardness is 122.3 HVand the conductivity is 4.03 渭 惟 路cm. At the same time, the microstructure of the sintered contact material is uniform and there is no obvious agglomeration. The analysis of the electrical contact properties of AgCr contacts shows that the electrical properties of AgCr contacts are superior to those of copper based silver contacts under the same test conditions, and the amount of material transfer of AgCr symmetrical contacts is larger than that of AgSnO2 contacts. However, there are cracks on the contact surface of AgSnO2 contacts, and the AgCr symmetrical contacts keep the contact resistance low and stable after the closing breaking current reaches 100000 times, while the on-to-break ratio of the circuit does not change. The general evaluation shows that: AgCr contacts have better electrical contact performance.
【學(xué)位授予單位】：暨南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2010
【分類號(hào)】：TM24

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本文編號(hào)：1987453