本文選題：印制電路板 + 防護(hù)工藝��； 參考：《華南理工大學(xué)》2015年碩士論文

【摘要】：印制電路板(Printed circuit board,PCB)是電子設(shè)備的主要功能承載單元,印制電路板的性能表現(xiàn)直接決定電子設(shè)備及其組成的系統(tǒng)的環(huán)境適應(yīng)性水平。環(huán)境適應(yīng)性是產(chǎn)品在壽命期內(nèi)預(yù)計(jì)可能遇到的各種環(huán)境的作用下能實(shí)現(xiàn)其所有預(yù)定功能、性能和不被破壞的能力,是產(chǎn)品的重要質(zhì)量特性之一。熱帶海洋環(huán)境條件具有高溫、高濕、高鹽霧和霉菌生長(zhǎng)活躍的特點(diǎn),高溫高濕(即“濕熱”)、鹽霧和霉菌環(huán)境條件對(duì)印制電路板的腐蝕老化作用顯著。為加強(qiáng)印制電路板的防護(hù)性能和電氣性能,一般都要在印制電路板組裝件表面涂覆敷形有機(jī)涂層。因此,研究熱帶海洋環(huán)境條件下印制電路板涂覆工藝的環(huán)境適應(yīng)性水平,對(duì)提高電子設(shè)備及系統(tǒng)長(zhǎng)期在海上作業(yè)時(shí)的功能、性能穩(wěn)定性具有重要意義。本論文以五種典型的印制電路板防護(hù)涂層工藝為研究對(duì)象,制定試驗(yàn)方案,開展試驗(yàn)研究與分析,提出改進(jìn)建議措施,并進(jìn)行驗(yàn)證。主要研究?jī)?nèi)容及成果包括:1.由于目前沒有可以直接采用的試驗(yàn)方案,本論文在分析南海熱帶海洋環(huán)境的主要條件及其影響,研究印制電路板標(biāo)準(zhǔn)樣品的制備要求、性能參數(shù)的檢測(cè)要求和試驗(yàn)方法要求的基礎(chǔ)上,制定了印制電路板防護(hù)工藝熱帶海洋環(huán)境適應(yīng)性試驗(yàn)方案;2.開展實(shí)驗(yàn)室模擬環(huán)境試驗(yàn)和18個(gè)月西沙熱帶海洋自然暴露環(huán)境試驗(yàn),定期對(duì)印制電路板防護(hù)工藝主要敏感性能指標(biāo)進(jìn)行檢測(cè),研究?jī)煞N試驗(yàn)條件下印制電路板防護(hù)工藝的性能變化規(guī)律,試驗(yàn)結(jié)果表明,實(shí)驗(yàn)室環(huán)境試驗(yàn)條件下,相對(duì)于濕熱和霉菌環(huán)境,鹽霧對(duì)印制電路板的腐蝕破壞作用最為明顯,自然大氣暴露試驗(yàn)條件下,印制電路板的防護(hù)涂層在試驗(yàn)18個(gè)月后性能參數(shù)已經(jīng)降低至極差的水平;3.提出提高印制電路板防護(hù)工藝熱帶海洋環(huán)境適應(yīng)性水平的建議措施,采取措施重新制備試驗(yàn)樣品后開展了試驗(yàn)驗(yàn)證,驗(yàn)證試驗(yàn)結(jié)果表明,改進(jìn)后的印制電路板防護(hù)性能良好,在實(shí)驗(yàn)室的模擬環(huán)境試驗(yàn)條件下外觀和電氣性能均未出現(xiàn)明顯的變化,改進(jìn)措施具有較顯著的效果。
[Abstract]:Printed circuit printed circuit (PCB) is the main functional bearing unit of electronic equipment. The performance of printed circuit board directly determines the environmental adaptability of electronic equipment and its composed system. Environmental adaptability is one of the important quality characteristics of a product, which can realize all its predefined functions, performance and ability not to be destroyed under the action of all kinds of environments expected to meet in the life cycle. The tropical marine environment conditions have the characteristics of high temperature, high humidity, high salt fog and active growth of mold. The corrosion aging effect of high temperature and high humidity (i.e. "damp and hot"), salt fog and mold environment on printed circuit board (PCB) is remarkable. In order to strengthen the protective and electrical properties of printed circuit board, the surface of printed circuit board assembly should be coated with organic coating. Therefore, it is of great significance to study the environmental adaptability level of printed circuit board coating process in tropical marine environment to improve the function and performance stability of electronic equipment and system in offshore operation for a long time. In this paper, five typical protective coating processes of printed circuit board (PCB) are taken as the research object, the experimental scheme is established, the experimental research and analysis are carried out, and the improvement measures are put forward and verified. The main research contents and results include: 1. Since there is no direct test scheme, this paper analyzes the main conditions and effects of the tropical marine environment in the South China Sea, and studies the preparation requirements of the PCB standard samples. On the basis of testing requirements and test methods for performance parameters, a test scheme for the adaptability of the protective process of printed circuit board to tropical marine environment was developed. Laboratory simulated environmental tests and 18 months of natural exposure tests in Xisha Tropical Ocean were carried out, and the main sensitive performance indexes of PCB protection technology were regularly tested. The performance change of PCB protection technology under two kinds of test conditions is studied. The results show that the corrosion and damage effect of salt fog on PCB is the most obvious compared with wet heat and mold environment in laboratory environment. Under the condition of natural atmospheric exposure test, the performance parameters of the protective coating of printed circuit board have been reduced to a very low level after 18 months of test. The measures to improve the adaptability of the protective process of printed circuit board to the tropical marine environment are put forward. The test results show that the improved printed circuit board has good protective performance after the test samples are reprepared. There is no obvious change in appearance and electrical performance under the condition of simulated environment test in laboratory, and the improvement measures have obvious effect.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN41

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