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我和我的许多palaeomagnetist同事,经常用热退磁(可能多达800°C)在我们的研究。通常是采用分段技术,所以每个样本加热——通常20次以上——逐步更高的温度。这可以成为一个问题有或脆性样本:作品必须粘在一起为了测量,但很少有粘合剂耐热的和非磁性。非磁性的,我的意思是,它应该尽可能少的剩磁;虽然也会好如果磁化率可以忽略不计,这是一个不重要的因素。在我寻找一个粘合剂耐热的以及非磁性,我看过:* UHU。良好的债券,非磁性,但不是很耐热的。即使是高温分解版本在250°C左右。除此之外,每个加热一步泄漏有毒burning-glue烟雾进实验室之前我必须re-glue所有样品测量。* Cyanoacrylate(又名强力胶)。 Non-magnetic, and bond usually OK, at least on fine-grained rocks. Even less heat-tolerant than UHU, but the fumes are a bit less noxious at least. * [Aremco Ceramabond 571](http://www.aremco.com/wp-content/uploads/2010/11/A02_13.pdf), a magnesium oxide based paste which easily fulfils the temperature requirement (it's rated to 1760°C) and was recommended to me as non-magnetic (albeit not by the manufacturer). Unfortunately it turned out to carry a significant mangetic remanence, and contaminated measurements unacceptably. (It might work reasonably for strongly-magnetized volcanic samples, though.) * [Sodium silicate](http://en.wikipedia.org/wiki/Sodium_silicate) in aqueous solution, a.k.a. water glass. Magnetically, this fits the bill. Kostadinova et al. (2004) reported that it doesn't appear to affect remanence measurements (although it does alter susceptibility). It's thermally stable up to the temperatures I care about and beyond. With clay-rich material I had some trouble with expansion (intumescence) of treated samples upon heating and have heard from other researchers that this is a known problem; Otaka et al. (2002) indicate that heating rate is also a factor. Another problem is that the adhesive properties are not ideal: sodium silicate works well as a binder for soaking and impregnating loose, friable material, but doesn't make a good contact adhesive for less porous rock. * Automotive silicone adhesives: I have seen various silicone adhesives designed for work on automotive exhaust systems. They would probably fulfil the temperature and adhesive requirements, but I haven't yet done any pilot studies on their magnetic properties. Given the intended applications, there's no reason for the manufacturers to specifically exclude magnetic compounds from the mix. I'd be interested to hear if anyone's tried any adhesives of this sort. I should add that the adhesive requirements are actually very modest: the join doesn't have to bear any load beyond the weight of the sample itself, which will not exceed 50g. ---- References: * Kostadinova, M., Jordanova, N., Jordanova, D., & Kovacheva, M. (2004). Preliminary study on the effect of water glass impregnation on the rock-magnetic properties of baked clay. *Studia Geophysica et Geodaetica*, 48(3), 637-646. * Otaka, T., & Asako, Y. (2002). Thermal intumescent characteristics of heated sodium silicate. *In ASME 2002 International Mechanical Engineering Congress and Exposition* (pp. 205-210). American Society of Mechanical Engineers.

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\ begingroup美元你看着refactory水泥吗?对他们的磁性虽然不确定,但是他们会没事的温度明智的。这些是用于管道、烟囱等。至于汽车排气产品,有灰泥和硅树脂。我倾向于同意你的观点关于灰泥,但我认为高温硅树脂用于排气歧管垫片修理有合适的好机会。 \ endgroup美元
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2014年5月28日18:47

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