版權(quán)說明:本文檔由用戶提供并上傳,收益歸屬內(nèi)容提供方,若內(nèi)容存在侵權(quán),請(qǐng)進(jìn)行舉報(bào)或認(rèn)領(lǐng)
文檔簡(jiǎn)介
1、覆銅板中絕緣層的導(dǎo)熱性能是制約基板散熱能力的關(guān)鍵因素。本論文以Al2O3、BN、金剛石為填料,環(huán)氧樹脂為基體,制備覆銅板用高導(dǎo)熱絕緣層。通過X射線衍射、掃描電鏡、紅外、差熱-熱重等表征手段,系統(tǒng)地研究了填料的種類、填充量、表面處理等因素對(duì)復(fù)合材料絕緣層的結(jié)構(gòu)與性能的影響。主要內(nèi)容如下:
?。?)實(shí)驗(yàn)基本工藝參數(shù)的確定:以70%不規(guī)則Al2O3為填料,環(huán)氧樹脂為基體,丁酮為溶劑,制備絕緣層。研究發(fā)現(xiàn),絕緣膠的粘度和脫氣方式對(duì)所得絕
2、緣層的外觀平整度影響較大,控制絕緣膠的粘度在2500~3500mPa·s范圍內(nèi),于0.09MPa的壓力下脫氣3min,連續(xù)三次,可得光滑、平整、無氣孔的絕緣層。通過DSC測(cè)試得出最佳固化溫度和時(shí)間為170℃、3h。
?。?)研究填料的種類、填充量、形貌等對(duì)絕緣層導(dǎo)熱性能的影響。分別以不規(guī)則Al2O3、球形Al2O3、BN、金剛石為填料制備了不同填充量的絕緣層,結(jié)果表明:同種填料,絕緣層的導(dǎo)熱系數(shù)隨填充量的增加而增大,但填充量增大
3、到一定值后,絕緣膠的粘度太大,不能成膜。不同填料,填料本征導(dǎo)熱系數(shù)越大,所得絕緣層的導(dǎo)熱系數(shù)越大,當(dāng)填充量為70%時(shí),以金剛石為填料制備的絕緣層導(dǎo)熱系數(shù)最高,達(dá)3.652W/(m·K)。對(duì)比不規(guī)則Al2O3與球形Al2O3,相同填充量下,球形Al2O3所得絕緣層的導(dǎo)熱系數(shù)較高。將不規(guī)則Al2O3分別與BN、金剛石混合,Al2O3填充量保持50%不變,金剛石為20%時(shí),導(dǎo)熱系數(shù)最高,為2.478W/(m·K)。
(3)以不規(guī)則A
4、l2O3為填料,分別用KH550、KH560和OP-10對(duì)其進(jìn)行表面處理,研究添加劑對(duì)絕緣層導(dǎo)熱性能的影響。經(jīng)過處理后,絕緣層導(dǎo)熱系數(shù)均有所提高,其中OP-10效果最佳。當(dāng)OP-10添加量3%時(shí),與未經(jīng)處理的絕緣層相比,所得絕緣層的導(dǎo)熱系數(shù)由原來的1.326W/(m·K)提高到2.041W/(m·K)。
?。?)對(duì)絕緣層的體積/表面電阻率、擊穿電壓、剝離強(qiáng)度、熱穩(wěn)定性、熱沖擊性能進(jìn)行了測(cè)試與分析,結(jié)果表明:所得絕緣層性能均能滿足
溫馨提示
- 1. 本站所有資源如無特殊說明,都需要本地電腦安裝OFFICE2007和PDF閱讀器。圖紙軟件為CAD,CAXA,PROE,UG,SolidWorks等.壓縮文件請(qǐng)下載最新的WinRAR軟件解壓。
- 2. 本站的文檔不包含任何第三方提供的附件圖紙等,如果需要附件,請(qǐng)聯(lián)系上傳者。文件的所有權(quán)益歸上傳用戶所有。
- 3. 本站RAR壓縮包中若帶圖紙,網(wǎng)頁(yè)內(nèi)容里面會(huì)有圖紙預(yù)覽,若沒有圖紙預(yù)覽就沒有圖紙。
- 4. 未經(jīng)權(quán)益所有人同意不得將文件中的內(nèi)容挪作商業(yè)或盈利用途。
- 5. 眾賞文庫(kù)僅提供信息存儲(chǔ)空間,僅對(duì)用戶上傳內(nèi)容的表現(xiàn)方式做保護(hù)處理,對(duì)用戶上傳分享的文檔內(nèi)容本身不做任何修改或編輯,并不能對(duì)任何下載內(nèi)容負(fù)責(zé)。
- 6. 下載文件中如有侵權(quán)或不適當(dāng)內(nèi)容,請(qǐng)與我們聯(lián)系,我們立即糾正。
- 7. 本站不保證下載資源的準(zhǔn)確性、安全性和完整性, 同時(shí)也不承擔(dān)用戶因使用這些下載資源對(duì)自己和他人造成任何形式的傷害或損失。
最新文檔
- The Research and Development of Sunlite Yarn Fabric Used as Thermal Underwear and the Study of Its Wear Performance.pdf
- A Comparative Study of Hedges Used in Different Genres.pdf
- A Case Study of Open Pit Copper Mine Design and Optimisation.pdf
- A Comparative Study of the Classroom Language Used by College English Language Teachers.pdf
- A Study on the Interactive English Teaching in High Schools.pdf
- A Survey Study on English Learning Strategies Used by Secondary Normal School Students.pdf
- mechanical and thermal evaluation of ultra high performance fiber reinforced concretes for engineering applications
- a study of english reading teaching in senior high schoo
- A Discursive Study of Science Textbooks--A Case Study of a Fourth--grade Science Textbook Used in an Elementary School.pdf
- iec 60507-2013 artificial pollution tests on high-voltage insulators to be used
- An Empirical Study of Reading Strategy in Comprehensive High School.pdf
- The Study on English Reading Strategies for Junior High Students.pdf
- A Study of Syntactic Complexity in High School English Writing.pdf
- A Study of English Vocabulary Learning in Senior High School.pdf
- Mechanical and thermal evaluation of Ultra High Performance Fiber Reinforced Concretes for engineering applications.pdf
- Mechanical and thermal evaluation of Ultra High Performance Fiber Reinforced Concretes for engineering applications.pdf
- used to do, be used to doing, be used to do辨析
- A Study on the Thermal Stratification Phenomena of Pressurizer Surge Line for Pressurized Water Reactor.pdf
- A Study on Culture Teaching in The Foreign Language Classroom in High Schools.pdf
- Novel Vapor Chamber Heat Spreader for Thermal Management of High Power Light Emitting Diodes.pdf
評(píng)論
0/150
提交評(píng)論