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    產品可靠性測試需要用到的氣候試驗



    1.鹽霧試驗

    本試驗是在試驗室進行的模擬裸露物體暴露在潮濕的鹽霧大氣環境中的試驗,其目的是通過規定的鹽霧條件來考核物體經過暴露在潮濕鹽霧大氣后的安全性和作用可靠性。試驗設備應包括一個鹽溶液儲存槽,足夠數量的噴霧嘴和試樣支撐物的暴露試驗箱,一個試驗箱加熱和溫度控制系統,一個帶有壓力調節器及一個壓縮空氣調濕系統的壓縮空氣源。將裸露的物體暴露在鹽霧大氣環境中,進行48h試驗是為了檢查物體的安全性和作用可靠性。進行%h試驗只是檢查物體的安全性。應按物體試驗要求從這兩種試驗周期中確定一項。每次試驗至少要用八發物體。在試驗箱內的四個方位(2.)上各試驗兩發物體。試驗后從每個方位上各取一發物體,趁其未干立即進行評定,另外四發物體晾干后再評定。48h試驗后應符合“一般要求”4.6.2.l a4.6.2.2的要求,%h試驗后應符合一般要求4.6.2.l a的要求。

    2.浸水試驗

    本試驗是在試驗室進行的模擬物體遭水浸泡條件的試驗,其目的是通過將物體浸人10.7m深的水中來考核物體經過浸水后的安全性和作用可靠性。試驗所需的設備包括一個能經受住所加壓力的壓力容器,該容器的尺寸應能夠盛下足以完全淹沒所有被試物體的所需的水。水溶液含有0.2%10.1%(按質量計)的熒光控制溫度和濕度的試驗箱。可使用能分別保持71℃和一54℃的專用試驗箱,也可采用一種能調節為兩種溫度的通用試驗箱。71℃的試驗箱其相對濕度必須低于20%物體可以放在任何位置,但它們彼此之間和試驗箱壁之間必須有適當的間隔,以利于保持規定的

    空氣濕度。

    主要進行以下三種試驗:

    (1)試驗I:物體放在一54℃條件下存放28天,隨后在71℃條件下再存放28天。

    (2)試驗II:物體放在54℃條件下存放28天。

    (3)試驗l:物體放在71℃條件下存放28天。

    試驗后應符合“一般要求”4.6.2.la4.6.2.2的要求。

    5.泄漏試驗

    本試驗通過檢測物體泄漏率來確定物體的泄漏率是否低于規定值。

    本試驗包括鹵素法、氮氣法、氣泡法和容積分配法。

    (1)微小泄漏(1x10一‘cm 3/s):采用鹵素法或氦氣法。

    (2)較小泄漏(El x一。-4cm3/8):采用氣泡法。

    (3)較大泄漏(E1 x10一’cm 3/8):采用容積分配法。

    這四種方法有各自不同的程序。如果泄漏率沒有規定,則應選擇鹵素法或氮氣法。鹵素法試驗設備包括一臺鹵素泄漏檢測計、一個鹵素泄漏標準器、鹵素氣體、必要的閥門和配件、一個低壓(0.2MPa)容器和一臺真空泵。不管物體充人或未充人示蹤氣體,只要有一個試驗孔或通向內腔的導管,就應當將試驗孔或導管與鹵素氣體源相連接。用鹵素氣體向物體內腔加壓,使壓力達到103.4kPa(表壓)。用調在最高靈敏度的鹵素泄漏檢測計的探頭對物體各個表面、連接處和密封處進行檢測。如果發現有泄漏,則應改變靈敏度范圍,直到測出泄漏率為止。

    氮氣法試驗設備包括一臺質譜儀、一臺靈敏度校準儀、氮氣、必要的閥門和配件、一個低壓(0.2MPa)容器和一臺真空泵。不管物體充人或未充人示蹤氣體,只要有一個試驗孔或通向內腔的導管,則將物體放人質譜儀泄漏檢測計的真空試驗箱內,將試驗孔或導管與真空泵及氮氣源相連接,將物體內腔的壓力抽真空到6.5kPa t 1.5kPa(絕對壓力)。然后關閉真空泵的閥門,將氦氣充人物體內,使壓力達到103.4 kPa(絕對壓力),操作泄漏檢測計,并觀察漏氣情況。

    氣泡法的試驗設備包括透明壓力容器、注水裝置、抽氣機及真空度壓力表。將物體放人盛有合適的泄漏試驗液的透明壓力容器中。容器中應有足夠的試驗液體,以保證物體浸人液體后到液面的距離不小于26mm。將物體放在處于液面上升位置的升降平臺上(對可能懸浮的物體要固定到平臺上)。封閉容器應根據被試物體浸入液體時的深度將液面上部空間內的空氣壓力減小到一定值。空氣壓力的選擇應使物體在浸人液體時,由容器空間壓力和液體壓力形成的物體外部的總壓力小于當時環境的大氣壓力。如果物體浸人水中的深度小于127mm,則空氣壓力減小1.3kPa即可。然后迅速降下平臺,使物體

    完全浸人試驗液體,將液面上部的空氣壓力減小到80.OkPa1.3kPa(絕對壓力),保壓2min進行觀察,如果有不斷的氣流或連續的小氣泡冒出,則表示泄漏。任何時候,如果觀察到有大氣泡冒出,則應立即停止試驗。容積分配法是用一套具有固定容積和已知特性的輔具將被試物體包封起來。需要規定的相關特性是:輔具容積的最大泄漏率及輔具與物體最小的空間容積。試驗系統儲氣筒中的壓力可以升高或降低到一個固定值,將包封物體的輔具內部空間與試驗系統的儲氣筒接通。當整個系統的總壓力達到平衡時,記錄此壓力,并與不漏氣的物體或假物體獲得的壓力值進行比較,當試驗壓力有明顯差別時,說明物體漏氣。試驗必須滿足物體技術條件中所規定的泄漏率要求或不超過Ix10一‘cm3/s(無規定)。試驗后應符合“一般要求”4.6.2.l a4.6.2.2的要求。

    6.沙塵試驗

    本試驗是試驗室進行的在模擬不利的儲存、處理、運輸和實戰環境的試驗。其目的是通過規定的沙塵環境來考核物體經過不利的儲存、處理、運輸和實戰環境后的安全性和作用可靠性。試驗所用的設備為一個能控制沙塵密度、空氣速度、溫度和濕度的試驗箱及其他輔助設備。試驗箱內自由空間應足以使沙塵進行適當的循環。物體占據的橫截面積不得超過試驗箱橫截面積的15%物體占據試驗箱的體積不得超過試驗箱體積的20%0試驗分為三個階段。室溫階段,將物體至于規定空氣速度、相對濕度和沙塵密度的23t 110℃室溫中,將被試物體置于塵流中,連續保持6h。過渡階段停止供給沙塵,將空氣速度減小到1.5m/s 1 1 m/s。試驗箱內的空氣溫度上升到63C11.49C,并調節相對濕度,使其控制在10%以下,待這些條件穩定后保持若干小時,使其盡可能的浸透。當溫度穩定到63℃時,可進行高溫試驗。高溫階段將溫度穩定在63CC 11.4CC,將被試物體置于塵流中,連續保持6h。高溫試驗完畢后,從試驗箱內取出物體并將其放在室溫下冷卻。試驗后應符合“一般要求"4.6.2.l a4.6.2.2的要求。將表面沙塵擦凈后,被檢部件應干凈且標記清楚。試驗用塵粉為最少含有97%二氧化硅時有棱角的硅石粉。

    塵粉粒度按質最計算應符合:

    (1)100%通過孔徑為149mm的篩網。

    (2)96%100%通過孔徑為105mm的篩網。

    (3)88%92%通過孔徑為74mm的篩網。

    (4)73%77%通過孔徑為44mm的篩網。

    更多試驗設備文章請點擊www.dghuanyi.com

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