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耐火陶瓷纖維相關概念
2012-06-21 17:53

1、耐火材料 

耐火度大于1580℃的無機非金屬材料。 

2、耐火纖維 

耐火度大于1580℃的纖維狀隔熱材料的總稱。 

3、熔點 

材料內部液相與固相處于平衡時的溫度。 

4、耐火度 

材料在高溫作用下達到特定軟化程度時的溫度。 
它代表材料抵抗高溫而不被融化的一種能力。 

5、分類溫度 

又稱為極限使用溫度,指耐火纖維在此溫度下能夠短時間使用的極限溫度。 

判定依據:耐火纖維在分類溫度下保溫24小時,加熱線收縮小于4%。 

6、工作溫度 

又稱為長期使用溫度,指耐火纖維在此溫度下能夠長時間安全使用的極限溫度。 

判定依據:耐火纖維在工作溫度下保溫24小時,加熱線收縮小于3%。 

7、耐壓強度 

耐火材料在一定溫度下,按一定速度增加壓力至其破壞時,單位面積上所承受的極限荷載。單位:MPa。 

8、抗拉強度 

耐火纖維制品單位面積上抵抗張拉應力的能力。單位:MPa。 

9、抗折強度 

耐火纖維制品單位面積承受彎矩時的極限折斷力。單位:MPa。 

10、加熱線變化 

將一定尺寸的試樣按規定的升溫制度加熱,并在規定的溫度下保持一定時間,然后在室溫下測量其長度后長度方向發生的不可逆轉的變化量。 

11、導熱系數 

A、物理意義:表征物質導熱能力的大小。 

B、數值表示:物質在1平方米的面積上,在1米的厚度上,在1小時的時間內,傳導的熱量為1瓦,則該物質的導熱系數為1W/m.k。1Kcal/m.h.℃=1.163 W/m.k。 

C、影響因素:物質的導熱系數值,取決于該物質的結構、容重、溫度、壓力、所處環境氣氛和濕度等因素。 

D、數值確定:通常采用直接測試法和計算法。 

計算法: 

天然料λ=0.035+0.203(t均/1000)2kcal.m.h.℃ 
合成料λ=0.054+0.272×10-6 t均2W/m.k 

測試法: 

熱線法。特點:速度快,精確度低。 
平板法。特點:速度慢,精確度高(我司采用)。 

12、渣球含量 

耐火陶瓷原棉中未成纖維部分的百分含量。一般要求渣球含量小于15% 。 

渣球:指粒徑大于0.25mm未成纖物質。 

13、非纖維狀物質含量 

耐火陶瓷原棉中未成纖維部分的百分含量。一般要求非纖維狀物質含量小于40% 。 

非纖維狀物質:指粒徑大于0.075mm未成纖維物質(包括渣球與部分粗短纖維)。
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