本文選題：鈦酸鉛 + 銅基復合材料�。� 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：本文選擇具有負膨脹性能的鈦酸鉛(Pb Ti O3,簡寫PT)陶瓷顆粒作為復合材料的增強體,選擇具有高熱導率的銅作為復合材料的基體,采用放電等離子燒結(jié)工藝制備了體積分數(shù)不同的鈦酸鉛顆粒增強銅基復合材料。利用物相及微觀組織結(jié)構分析方法(XRD、SEM、TEM等)觀察了復合材料中增強體與基體的形貌、界面特征、增強體與基體中位錯孿晶情況。采用熱膨脹儀和熱導率測試設備測試并分析了復合材料的熱膨脹性能和導熱能力。利用電子萬能試驗機測試了復合材料的壓縮屈服強度;利用智能電阻測試儀測試了復合材料的電導率。物相和微觀結(jié)構分析表明,放電等離子燒結(jié)制備的Pb Ti O3/Cu復合材料具有清晰光滑的界面形貌,而且看不到明顯的界面反應,增強體與基體界面結(jié)合較弱。TEM觀察結(jié)果證實燒結(jié)態(tài)的復合材料中有大量的位錯、孿晶產(chǎn)生,表明復合材料中存在大量的熱錯配應力。復合材料的熱膨脹系數(shù)與PT顆粒的體積分數(shù)成負相關性,即PT顆粒的體積分數(shù)越大,復合材料的熱膨脹系數(shù)越低。復合材料界面結(jié)合較弱且內(nèi)部殘余應力復雜,導致復合材料熱膨脹系數(shù)不穩(wěn)定,但是可以通過適當?shù)臒崽幚韥硖岣邿崤蛎浵禂?shù)的穩(wěn)定性。通過Zr摻雜可以降低鈦酸鉛的居里溫度,PZT/Cu復合材料在較低溫度就能產(chǎn)生窄而強烈的負膨脹行。增強體體積分數(shù)和分布情況明顯影響復合材料的熱導率。當增強體體積分數(shù)較高時,一方面增強體的低熱導率導致整個復合材料的熱導率降低,另一方面增強體體積分數(shù)較高時,復合材料中產(chǎn)生了更多的界面,界面阻礙熱傳導,從而進一步降低復合材料的熱導率。復合材料的壓縮屈服強度對增強體與基體界面狀態(tài)和增強體分布均勻性較敏感。復合材料的電導率與增強體體積分數(shù)成負相關,且熱循環(huán)會改善復合材料的電導率。
[Abstract]:In this paper, lead titanate (PbTiO _ 3) ceramic particles with negative dilatability are selected as reinforcements of composites, and copper with high thermal conductivity is chosen as matrix of composites.Copper matrix composites reinforced by lead titanate particles with different volume fraction were prepared by spark plasma sintering (SPS).The morphology, interfacial characteristics and dislocation twins of the reinforcements and the matrix in the composites were observed by means of phase and microstructure analysis.The thermal expansion properties and thermal conductivity of the composites were tested and analyzed by means of thermal expansion instrument and thermal conductivity test equipment.The compressive yield strength of the composite was measured by the electronic universal tester and the conductivity of the composite was measured by the intelligent resistance tester.The results of phase and microstructure analysis show that the PbTi O3/Cu composites prepared by SPS have clear and smooth interface morphology, and there is no obvious interface reaction.The observed results of weak interface between reinforcements and matrix show that there are a large number of dislocations and twinning in the sintered composites, which indicates that there are a lot of thermal mismatch stresses in the composites.The thermal expansion coefficient of the composites is negatively correlated with the volume fraction of PT particles, that is, the larger the volume fraction of PT particles, the lower the thermal expansion coefficient of the composites.The interfacial bonding of the composites is weak and the internal residual stress is complex, which leads to the instability of the thermal expansion coefficient of the composites, but the stability of the thermal expansion coefficient can be improved by proper heat treatment.Zr doping can reduce the Curie temperature of PZT / Cu composites and produce narrow and strong negative expansion lines at lower temperatures.The volume fraction and distribution of the reinforcements have a significant effect on the thermal conductivity of the composites.When the volume fraction of reinforcements is high, on the one hand, the low thermal conductivity of the reinforcements leads to the decrease of the thermal conductivity of the composites; on the other hand, when the volume fraction of the reinforcements is high, more interfaces are produced in the composites, which hinder the thermal conduction.Thus, the thermal conductivity of the composites is further reduced.The compressive yield strength of the composites is sensitive to the interface state between the reinforcements and the matrix and the distribution uniformity of the reinforcements.The conductivity of the composites is negatively correlated with the volume fraction of the reinforcements, and thermal cycling can improve the conductivity of the composites.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB333

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本文編號：1767522