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景德鎮子昊陶瓷有限公司-PVC手模  丁腈手模   硅膠手模  等各種陶瓷手模

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新聞中心景德鎮(zhen)子昊陶(tao)瓷有限(xian)公司-PVC手(shou)(shou)模 丁(ding)腈手(shou)(shou)模 硅膠(jiao)手(shou)(shou)模 等各種陶(tao)瓷手(shou)(shou)模

陶瓷手模抗熱震損傷性分析

2015-05-07(2354)次瀏覽(lan)

只要材料(liao)(liao)中(zhong)較大(da)(da)熱(re)應力值(一(yi)般在表面(mian)及核心部位)不(bu)超過材料(liao)(liao)的(de)(de)(de)強度(du)限值(對于脆性(xing)材料(liao)(liao)就(jiu)應取其(qi)抗(kang)張強度(du)限值)則材料(liao)(liao)不(bu)致開(kai)裂,因此(ci)材料(liao)(liao)中(zhong)允許存在的(de)(de)(de)較大(da)(da)溫差值越大(da)(da),就(jiu)說明(ming)材料(liao)(liao)能承(cheng)受的(de)(de)(de)溫度(du)變化越大(da)(da),即(ji)抗(kang)熱(re)震性(xing)就(jiu)越好,但(dan)實際情(qing)況要復雜得多(duo),材料(liao)(liao)是否出現(xian)熱(re)應力開(kai)裂,除(chu)了與(yu)熱(re)應力值的(de)(de)(de)大(da)(da)小(xiao)有關(guan)系,還與(yu)產生的(de)(de)(de)速(su)率和持(chi)續(xu)時間、材料(liao)(liao)的(de)(de)(de)特性(xing)以及原先存在的(de)(de)(de)缺陷等情(qing)況有關(guan)。

        實際上制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)的(de)(de)熱(re)應力還與材料的(de)(de)熱(re)導率,幾何形狀和大(da)小(xiao),制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)表(biao)(biao)(biao)面(mian)(mian)(mian)對(dui)(dui)環(huan)(huan)境(jing)(jing)(jing)進行熱(re)傳(chuan)(chuan)(chuan)系(xi)數(shu)(shu)(shu)小(xiao)等,都有利于制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)中(zhong)溫度趨于均(jun)勻,而使(shi)制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)的(de)(de)抗熱(re)震性(xing)得以改(gai)善(shan)。另外(wai)表(biao)(biao)(biao)面(mian)(mian)(mian)傳(chuan)(chuan)(chuan)熱(re)系(xi)數(shu)(shu)(shu)是表(biao)(biao)(biao)示制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)表(biao)(biao)(biao)面(mian)(mian)(mian)與環(huan)(huan)境(jing)(jing)(jing)介(jie)質(zhi)間(jian)(jian),在單(dan)(dan)位溫差下,它的(de)(de)單(dan)(dan)位面(mian)(mian)(mian)積上,單(dan)(dan)位時間(jian)(jian)能(neng)傳(chuan)(chuan)(chuan)遞給環(huan)(huan)境(jing)(jing)(jing)介(jie)質(zhi)的(de)(de)熱(re)量(liang)或者(zhe)從環(huan)(huan)境(jing)(jing)(jing)介(jie)質(zhi)中(zhong)所吸收(shou)的(de)(de)熱(re)量(liang),顯然表(biao)(biao)(biao)面(mian)(mian)(mian)傳(chuan)(chuan)(chuan)熱(re)系(xi)數(shu)(shu)(shu)和環(huan)(huan)境(jing)(jing)(jing)介(jie)質(zhi)的(de)(de)性(xing)質(zhi)和狀態有關(guan),例如在平靜的(de)(de)空氣(qi)中(zhong),表(biao)(biao)(biao)面(mian)(mian)(mian)傳(chuan)(chuan)(chuan)熱(re)系(xi)數(shu)(shu)(shu)數(shu)(shu)(shu)值就小(xiao),若制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)表(biao)(biao)(biao)面(mian)(mian)(mian)接觸的(de)(de)是高(gao)速氣(qi)流,則(ze)(ze)氣(qi)體(ti)就能(neng)迅速地帶走制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)表(biao)(biao)(biao)面(mian)(mian)(mian)的(de)(de)熱(re)量(liang),則(ze)(ze)表(biao)(biao)(biao)面(mian)(mian)(mian)傳(chuan)(chuan)(chuan)熱(re)系(xi)數(shu)(shu)(shu)就大(da)。造成(cheng)制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)表(biao)(biao)(biao)面(mian)(mian)(mian)的(de)(de)溫差就增大(da),因(yin)而制(zhi)(zhi)(zhi)(zhi)(zhi)品(pin)被損壞的(de)(de)危險性(xing)就增加,陶瓷手(shou)模在使(shi)用過程中(zhong),所處的(de)(de)環(huan)(huan)境(jing)(jing)(jing)對(dui)(dui)其(qi)使(shi)用壽(shou)命的(de)(de)影響起著決定性(xing)的(de)(de)作用,同樣(yang)的(de)(de)手(shou)模在不(bu)同的(de)(de)環(huan)(huan)境(jing)(jing)(jing)中(zhong)應用,其(qi)壽(shou)命相(xiang)差很大(da)。


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