本文選題：電子銀粉 + 正銀漿料��； 參考：《華中科技大學(xué)》2014年碩士論文

【摘要】：電子銀粉是高性能導(dǎo)電漿料的關(guān)鍵材料，其形貌、粒徑大小、粒度分布等直接影響漿料的絲網(wǎng)印刷性能和電氣性能。太陽(yáng)能電池正銀漿料作為一種新型的導(dǎo)電漿料對(duì)電子銀粉的性能提出了較高的要求。 化學(xué)還原法是制備銀粉的主要方法，該方法就是使用還原劑把銀離子從其化合物溶液中還原為銀單質(zhì)，并以粉末的形式沉積出來(lái)。反應(yīng)過(guò)程中的主要工藝參數(shù)，如攪拌速度、溶液PH值、反應(yīng)溫度等對(duì)銀粉的性能有直接影響。 論文在分析液相化學(xué)還原法反應(yīng)原理的基礎(chǔ)上，設(shè)計(jì)了一套基于PLC與HMI的自動(dòng)化反應(yīng)系統(tǒng)。該系統(tǒng)采用異步串行方式使PLC與二次儀表進(jìn)行通信，實(shí)現(xiàn)了反應(yīng)釜中攪拌速度、溶液PH值、反應(yīng)溫度等工藝參數(shù)的自動(dòng)控制。 系統(tǒng)的硬件設(shè)計(jì)主要包括三部分：采用S7-200PLC與MM440變頻器通信，實(shí)現(xiàn)攪拌速度的控制；采用PID控制算法，由PLC、PH儀表、PH電極、電磁閥等實(shí)現(xiàn)溶液PH值的控制；采用溫控儀表，由熱電偶、晶閘管、電熱絲等實(shí)現(xiàn)反應(yīng)溫度控制。觸摸屏作為上位機(jī)通過(guò)PPI協(xié)議與PLC通信，采用Modbus RTU協(xié)議與PH儀表、溫控儀表通信，實(shí)現(xiàn)對(duì)系統(tǒng)的操作控制。 系統(tǒng)的軟件設(shè)計(jì)采用STEP7-Micro/WIN對(duì)PLC進(jìn)行編程，設(shè)計(jì)了系統(tǒng)控制程序，并利用EasyBuilder8000設(shè)計(jì)了操作界面。系統(tǒng)具有定時(shí)、參數(shù)設(shè)置、數(shù)據(jù)記錄與查詢、密保等功能，操作簡(jiǎn)單、功能完善。 在系統(tǒng)完成后，進(jìn)行了銀粉制備試驗(yàn)，，并對(duì)制得的銀粉進(jìn)行了掃描電鏡（SEM）分析和粒度分布測(cè)試，選取性能較好的銀粉制成了銀漿，在單晶硅片上進(jìn)行印刷、燒結(jié)，制成太陽(yáng)能電池片，對(duì)電池片的性能進(jìn)行了測(cè)試，結(jié)果表明電池的轉(zhuǎn)換效率等指標(biāo)達(dá)到了較好的水平。 反應(yīng)系統(tǒng)經(jīng)實(shí)際使用，運(yùn)行穩(wěn)定、可靠，系統(tǒng)的結(jié)構(gòu)合理、操作方便，能生產(chǎn)出一致性好、粒度均勻，球形度較好的高性能電子銀粉。
[Abstract]:Electronic silver powder is the key material of high performance conductive paste. Its morphology, particle size and particle size distribution directly affect the screen printing and electrical properties of the paste. As a new type of conductive paste, solar cell silver paste has put forward higher requirements for the performance of electronic silver powder. Chemical reduction is the main method of silver powder preparation. The method is to reduce silver ion from its compound solution to silver simple substance and deposit it as powder. The main process parameters, such as stirring speed, pH value of solution and reaction temperature, have a direct effect on the properties of silver powder. On the basis of analyzing the principle of liquid-phase chemical reduction reaction, an automatic reaction system based on PLC and HMI is designed. The system uses asynchronous serial mode to make PLC communicate with the secondary instrument, and realizes the automatic control of stirring speed, pH value of solution, reaction temperature and other technological parameters in the reactor. The hardware design of the system mainly includes three parts: using S7-200PLC to communicate with MM440 frequency converter to realize the control of stirring speed; using PID control algorithm to realize the control of PH value of solution by PLC PH instrument, PH electrode, solenoid valve and so on; using temperature control instrument, adopting temperature control instrument, The reaction temperature is controlled by thermocouple, thyristor and electric wire. The touch screen communicates with PLC through PPI protocol, and uses Modbus RTU protocol to communicate with PH instrument and temperature control instrument to realize the operation and control of the system. The software design of the system uses STEP7-Micro/WIN to program the PLC, designs the control program of the system, and designs the operating interface by using EasyBuilder8000. The system has timing, parameter setting, data recording and query, secret protection and other functions, simple operation, perfect function. After the completion of the system, the silver powder preparation test was carried out, and the silver powder was analyzed by scanning electron microscope (SEM) and the particle size distribution was tested. Silver paste was made from the silver powder with good performance, and the silver powder was printed and sintered on the single crystal silicon wafer. The performance of the solar cell is tested. The results show that the conversion efficiency of the battery has reached a good level. The reaction system has been used in practice, running stably and reliably, the structure of the system is reasonable, the operation is convenient, and the high performance electronic silver powder with good consistency, uniform particle size and good sphericity can be produced.
【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】：2014
【分類號(hào)】：TM914.4

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本文編號(hào)：1911657