一、導熱硅脂的作用是什么
導(dao)熱(re)(re)(re)(re)(re)(re)硅脂(zhi)(zhi)(zhi)俗稱散熱(re)(re)(re)(re)(re)(re)膏、導(dao)熱(re)(re)(re)(re)(re)(re)膏、散熱(re)(re)(re)(re)(re)(re)硅脂(zhi)(zhi)(zhi),導(dao)熱(re)(re)(re)(re)(re)(re)硅脂(zhi)(zhi)(zhi)最大的(de)作用就是涂(tu)(tu)抹在半(ban)(ban)(ban)導(dao)體器(qi)件(jian)發(fa)熱(re)(re)(re)(re)(re)(re)體和散熱(re)(re)(re)(re)(re)(re)設施之間(jian)的(de)接觸面上,填(tian)充界面部位的(de)孔隙,取(qu)代低導(dao)熱(re)(re)(re)(re)(re)(re)率的(de)空氣(qi),減少熱(re)(re)(re)(re)(re)(re)阻(zu),增強導(dao)熱(re)(re)(re)(re)(re)(re)。涂(tu)(tu)抹了導(dao)熱(re)(re)(re)(re)(re)(re)硅脂(zhi)(zhi)(zhi)后(hou),可以(yi)讓半(ban)(ban)(ban)導(dao)體器(qi)件(jian)工作產(chan)生的(de)熱(re)(re)(re)(re)(re)(re)量更好傳遞(di)給散熱(re)(re)(re)(re)(re)(re)器(qi),防(fang)(fang)止(zhi)局(ju)部溫度過高而令半(ban)(ban)(ban)導(dao)體器(qi)件(jian)損傷。這樣即(ji)使(shi)在長(chang)時間(jian)工作后(hou)發(fa)熱(re)(re)(re)(re)(re)(re)體的(de)溫度都(dou)會處于恒溫狀態,因為(wei)多(duo)余(yu)的(de)熱(re)(re)(re)(re)(re)(re)量可以(yi)散發(fa)出去。除此(ci)之外,導(dao)熱(re)(re)(re)(re)(re)(re)硅脂(zhi)(zhi)(zhi)還可以(yi)起到(dao)防(fang)(fang)塵(chen)、防(fang)(fang)腐蝕的(de)作用,進一步保(bao)護半(ban)(ban)(ban)導(dao)體器(qi)件(jian)。
二、導熱硅脂怎么涂
1、去除涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)雜質:在(zai)涂(tu)(tu)(tu)抹(mo)(mo)導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)之前,首先應該確保涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)的(de)(de)(de)(de)光潔,檢查一下表(biao)面(mian)(mian)是(shi)否有(you)(you)(you)雜質、塵埃等(deng),也檢查一下涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)的(de)(de)(de)(de)表(biao)面(mian)(mian)是(shi)否有(you)(you)(you)銹(xiu)(xiu)斑(ban),以(yi)免影響到(dao)接下來(lai)的(de)(de)(de)(de)操(cao)作。假如涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)有(you)(you)(you)銹(xiu)(xiu)斑(ban)等(deng),會導(dao)致導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)的(de)(de)(de)(de)涂(tu)(tu)(tu)抹(mo)(mo)不充(chong)分,減少導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)的(de)(de)(de)(de)使(shi)用(yong)壽命。2、均(jun)勻涂(tu)(tu)(tu)抹(mo)(mo):確保涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)光潔之后(hou),接下來(lai)就是(shi)最重要的(de)(de)(de)(de)涂(tu)(tu)(tu)抹(mo)(mo)環節了(le)。在(zai)涂(tu)(tu)(tu)抹(mo)(mo)導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)的(de)(de)(de)(de)時候,可(ke)以(yi)先將少量導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)放(fang)置(zhi)在(zai)涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)上,然后(hou)用(yong)刮板刮均(jun)勻即可(ke)。在(zai)這里,可(ke)以(yi)采用(yong)“一字(zi)刮抹(mo)(mo)”、“十字(zi)刮抹(mo)(mo)”等(deng)的(de)(de)(de)(de)方(fang)法,目的(de)(de)(de)(de)是(shi)使(shi)得放(fang)置(zhi)在(zai)涂(tu)(tu)(tu)覆(fu)(fu)(fu)層(ceng)(ceng)(ceng)上的(de)(de)(de)(de)導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)均(jun)勻且(qie)輕薄。涂(tu)(tu)(tu)抹(mo)(mo)完導(dao)熱(re)(re)(re)(re)硅(gui)脂(zhi)(zhi)(zhi)后(hou)觀察表(biao)面(mian)(mian)是(shi)否有(you)(you)(you)氣泡,有(you)(you)(you)氣泡的(de)(de)(de)(de)地方(fang)需(xu)要用(yong)刮板刮平。
三、導熱硅脂的導熱系數一般是多少
導(dao)(dao)(dao)熱(re)系(xi)(xi)數是指在(zai)穩定傳熱(re)條件下(xia),1m厚的材料,兩側表面(mian)(mian)的溫差為1度(K,℃),在(zai)1秒鐘內,通過1平方(fang)米面(mian)(mian)積傳遞的熱(re)量,其(qi)(qi)(qi)單位是瓦/米·度,符(fu)號是W/(m·K)。導(dao)(dao)(dao)熱(re)硅(gui)脂導(dao)(dao)(dao)熱(re)系(xi)(xi)數的高低基本上(shang)取決(jue)于其(qi)(qi)(qi)組成物質,不同種類的導(dao)(dao)(dao)熱(re)硅(gui)脂導(dao)(dao)(dao)熱(re)系(xi)(xi)數有(you)(you)所不同,正規廠家生產的導(dao)(dao)(dao)熱(re)硅(gui)脂都(dou)會標明導(dao)(dao)(dao)熱(re)系(xi)(xi)數。一般來說,市面(mian)(mian)上(shang)常(chang)見(jian)的普通導(dao)(dao)(dao)熱(re)硅(gui)脂的導(dao)(dao)(dao)熱(re)系(xi)(xi)數在(zai)0.8~5.0W/(m·K)左右(you),也有(you)(you)一些高端的導(dao)(dao)(dao)熱(re)硅(gui)脂產品,其(qi)(qi)(qi)導(dao)(dao)(dao)熱(re)系(xi)(xi)數可(ke)達10W/(m·k)以上(shang)。
四、導熱硅脂和導熱硅膠的區別
1、導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)系(xi)數不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)的(de)(de)(de)(de)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)系(xi)數為0.3到1.0之(zhi)間(jian)(jian),導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)的(de)(de)(de)(de)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)系(xi)數在(zai)(zai)0.6到1.5之(zhi)間(jian)(jian),適用(yong)領域(yu)有(you)(you)所不(bu)(bu)同(tong)(tong)(tong)。2、絕(jue)緣(yuan)(yuan)(yuan)性(xing)能(neng)不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)的(de)(de)(de)(de)絕(jue)緣(yuan)(yuan)(yuan)性(xing)能(neng)很(hen)一(yi)(yi)般,在(zai)(zai)制作(zuo)過程(cheng)中(zhong)添加(jia)了(le)金屬粉,一(yi)(yi)定(ding)(ding)程(cheng)度(du)上限制了(le)絕(jue)緣(yuan)(yuan)(yuan)性(xing)能(neng)的(de)(de)(de)(de)發揮。而(er)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)有(you)(you)著(zhu)良好的(de)(de)(de)(de)絕(jue)緣(yuan)(yuan)(yuan)性(xing)能(neng),更適用(yong)于(yu)對絕(jue)緣(yuan)(yuan)(yuan)性(xing)能(neng)要求較(jiao)高的(de)(de)(de)(de)行(xing)業中(zhong)。3、導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)效果不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)的(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)阻很(hen)小,比同(tong)(tong)(tong)類(lei)的(de)(de)(de)(de)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)片(pian)的(de)(de)(de)(de)效果好很(hen)多。而(er)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)的(de)(de)(de)(de)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)功能(neng)更強一(yi)(yi)些,比導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)略(lve)勝一(yi)(yi)籌。4、固化(hua)情(qing)況不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)沒有(you)(you)任何的(de)(de)(de)(de)粘(zhan)接性(xing),永遠不(bu)(bu)會固化(hua)。而(er)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)卻(que)不(bu)(bu)同(tong)(tong)(tong),有(you)(you)著(zhu)一(yi)(yi)定(ding)(ding)的(de)(de)(de)(de)粘(zhan)結性(xing),常溫下(xia)可以(yi)(yi)完成固化(hua)。5、使(shi)用(yong)溫度(du)不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)在(zai)(zai)-50~200℃環(huan)境(jing)中(zhong)使(shi)用(yong)。而(er)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)可以(yi)(yi)在(zai)(zai)280度(du)的(de)(de)(de)(de)環(huan)境(jing)中(zhong)工作(zuo),也可以(yi)(yi)在(zai)(zai)零(ling)下(xia)60度(du)的(de)(de)(de)(de)環(huan)境(jing)中(zhong)工作(zuo)。6、用(yong)途不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)適用(yong)于(yu)散(san)熱(re)(re)(re)(re)(re)(re)片(pian)與CPU之(zhi)間(jian)(jian),起到填充作(zuo)用(yong)。而(er)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)適用(yong)于(yu)電(dian)子元(yuan)器(qi)件相關的(de)(de)(de)(de)行(xing)業,起到密封(feng)(feng)灌封(feng)(feng)作(zuo)用(yong)。7、價格(ge)不(bu)(bu)同(tong)(tong)(tong):導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)脂(zhi)按(an)瓶(ping)賣(mai),幾十元(yuan)一(yi)(yi)瓶(ping)。而(er)導(dao)(dao)(dao)(dao)(dao)熱(re)(re)(re)(re)(re)(re)硅(gui)(gui)(gui)(gui)膠(jiao)(jiao)按(an)照(zhao)公(gong)斤來賣(mai),價格(ge)不(bu)(bu)算便宜。
五、導熱硅脂怎么選
1、看性能:主要看導熱硅脂的導熱系數、耐久性、絕緣性、耐溫性等,好的導熱硅脂應具有良好的導熱性能、絕緣性能、耐高低溫,可使用較長時間。2、看導熱硅脂品牌:市(shi)面上(shang)有(you)(you)著各(ge)種各(ge)樣(yang)的(de)散熱(re)硅脂,品(pin)牌(pai)不(bu)(bu)同(tong)(tong),質量(liang)(liang)有(you)(you)所不(bu)(bu)同(tong)(tong),建議(yi)(yi)選擇大(da)牌(pai)廠家生產(chan)的(de)產(chan)品(pin),畢竟(jing)導(dao)熱(re)硅脂的(de)作用還是比較重要(yao)(yao)的(de),質量(liang)(liang)不(bu)(bu)好可能導(dao)致CPU損壞。3、看價格:導(dao)熱(re)硅脂不(bu)(bu)建議(yi)(yi)選擇價格太低的(de)產(chan)品(pin),價格高的(de)導(dao)熱(re)硅脂通常(chang)導(dao)熱(re)系數(shu)比較高,要(yao)(yao)不(bu)(bu)要(yao)(yao)買,需(xu)要(yao)(yao)要(yao)(yao)看有(you)(you)沒有(you)(you)經常(chang)運行大(da)型(xing)繪(hui)圖軟件、玩大(da)型(xing)游(you)戲、CPU需(xu)要(yao)(yao)超頻之類的(de)需(xu)求。