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技術(shù)文章 / article 您的位置:網(wǎng)站首頁 > 技術(shù)文章 > SDMF300 熱電偶防腐絕緣套管的材質(zhì)特性有哪些

SDMF300 熱電偶防腐絕緣套管的材質(zhì)特性有哪些

更新時間:2025-09-02  點擊次數(shù): 57次

熱電偶防腐絕緣套管用于隔絕腐蝕性介質(zhì)與熱電偶絲,兼具絕緣與防腐功能,其材質(zhì)特性及場景化選型如下:

一、核心材質(zhì)特性

聚四氟乙烯(PTFE)套管:耐溫 - 200~260℃,耐幾乎所有強酸強堿(如氫氟酸、王水),絕緣電阻≥1000MΩ,表面光滑(摩擦系數(shù)≤0.04),不易結(jié)垢,但機械強度低(抗拉強度 15-30MPa),易受外力沖擊損壞。

氯化聚醚(CPE)套管:耐溫 - 40~120℃,耐酸、堿、鹽溶液腐蝕(如 10% 鹽酸、20% 氫氧化鈉),柔韌性好(斷裂伸長率≥200%),可彎曲安裝,成本低于 PTFE 套管,但耐溫與耐強腐蝕性能較弱。

玻璃纖維增強塑料(FRP)套管:耐溫 - 50~180℃,耐腐蝕性優(yōu)(耐鹽霧腐蝕 1000 小時無損壞),機械強度高(抗拉強度≥100MPa),絕緣性能好(絕緣電阻≥500MΩ),但耐強氧化性酸(如濃硝酸)性能差。

陶瓷絕緣套管:耐溫 1200-1600℃,耐酸堿腐蝕(除氫氟酸外),硬度高(HV1500-2200),絕緣性能穩(wěn)定(在 1000℃時絕緣電阻≥10MΩ),但脆性大(斷裂韌性≤5MPa?m^(1/2)),安裝時需避免碰撞。

二、場景化選型

低溫強腐蝕場景(-200~80℃,如化工低溫酸洗槽,介質(zhì)為 30% 鹽酸):選擇 PTFE 套管(壁厚 1-2mm),其耐溫與耐強腐蝕性能適配;安裝時需避免彎曲半徑過?。ā萏坠芡鈴降?10 倍),防止套管開裂;若用于振動環(huán)境,外部包裹不銹鋼編織網(wǎng),增強機械防護。

常溫弱腐蝕場景(0~50℃,如食品加工車間,介質(zhì)為弱酸性清洗液):選用 CPE 套管(壁厚 0.8-1.5mm),成本低且柔韌性好,可適應復雜安裝路徑;安裝后定期(每 3 個月)用清水沖洗套管表面,去除殘留腐蝕介質(zhì),延長使用壽命。

中溫戶外腐蝕場景(50~150℃,如沿海地區(qū)戶外管道測溫,含高鹽霧氣):選擇 FRP 套管(壁厚 2-3mm),耐鹽霧腐蝕與機械強度滿足需求;套管連接處用 FRP 膠水密封,防止霧氣滲入;戶外安裝時需加裝防曬層(如鋁箔反射膜),避免陽光直射導致老化加速。

高溫腐蝕場景(800~1200℃,如冶金廠高溫爐測溫,含硫氧化物):選用陶瓷絕緣套管(壁厚 3-5mm),耐溫與耐腐性能優(yōu)異;安裝時用耐高溫水泥固定,避免振動導致套管移位;每 6 個月檢查套管是否有腐蝕剝落,若剝落面積超過 20%,需及時更換。


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