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首页> 外文会议>International Conference on Recrystallization and Grain Growth(ReX amp; GG III); 20070610-15; Jeju Island(KR) >Devitrification and High Temperature Properties of Mineral Wool
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Devitrification and High Temperature Properties of Mineral Wool

机译：矿棉的失透性和高温性能

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摘要

Mineral wool products can be used for thermal and acoustic insulation as well as for fire protection. The high temperature properties and the crystallization behaviour (devitrification) of the amorphous fibres during heating have been examined. Commercial stone wool and commercial hybrid wool (stone wool produced by a glass wool process) have been compared, as well as specially produced stone wool fibres. The fibres differed in chemical compositions and degree of oxidation given by Fe~(3+)/Fe_(total) ratios. The materials were studied by thermal stability tests. X-ray diffraction, Mossbauer spectroscopy, secondary neutral mass spectroscopy, differential scanning calorimetry and thermal gravimetric analysis. When stone wool fibres were heated at 800 ℃ in air, oxidation of Fe~(2+) to Fe~(3+) occurred simultaneously with migration of divalent cations (especially Mg~(2+)) to the surface. Decreasing Fe~(3+)/Fe_(total) ratios resulted in increasing migration and improved thermal stability. The cations formed a surface layer mainly consisting of MgO. When heated to above 800 ℃, bulk crystallization of the fibres took place with diopside and nepheline as the main crystalline phases. Commercial stone wool and the specially made fibres were considerably more temperature stable than the commercial hybrid wool. Commercial hybrid wool has a high Fe~(3+)/Fe_(total) ratio of 65% resulting in less migration of cations during heat treatment.
机译：矿棉产品可用于隔热和隔音以及防火。研究了无定形纤维在加热过程中的高温性能和结晶行为（失透）。比较了商用石棉和商用混合棉（通过玻璃棉工艺生产的石棉），以及专门生产的石棉纤维。纤维的化学组成和氧化度由Fe〜（3 +）/ Fe_（总）比决定。通过热稳定性测试对材料进行了研究。 X射线衍射，Mossbauer光谱，二次中性质谱，差示扫描量热法和热重分析。当石棉纤维在空气中于800℃加热时，Fe〜（2+）氧化为Fe〜（3+）同时发生二价阳离子（尤其是Mg〜（2+））向表面迁移。 Fe〜（3 +）/ Fe_（总）比的降低导致迁移增加，热稳定性提高。阳离子形成主要由MgO组成的表面层。当加热到800℃以上时，纤维的大量结晶以透辉石和霞石为主要结晶相发生。市售的石棉和特制纤维比市售的混合棉具有更高的温度稳定性。市售杂种羊毛的Fe〜（3 +）/ Fe_（总）比率高，达到65％，从而减少了热处理过程中阳离子的迁移。

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