Thermiculite® 866LS was designed for, and proven in, Solid Oxide Fuel Cell applications. The components of Thermiculite® 866LS ensure that a seal is created and then maintained in service.
- Sealing achieved at very low surface stresses
- Extremely high level of sealing efficiency achieved
- Sealing performance not reduced by thermal cycling
- Sealing coating compensates for irregularities in surfaces to be sealed
- Gasket cutting just as easy as for Thermiculite® 866
Following development work at the VTT Technical Research Centre of Finland, see reference, Flexitallic have introduced ThermiculiteŽ 866 LS, using a further developed form of the coating to allow the range use of ThermiculiteŽ 866 to be extended to those stack designs only offering a very low sealing stress.
A minor amount of glass powder is bound to each surface during the manufacturing process so that at the operational temperature of the SOFC cell ThermiculiteŽ 866 LS has a very thin coating of molten glass on each surface which seals the interfacial leakage paths. No initial glass sintering cycle to above the operating temperature of the SOFC stack is required with Thermiculite 866 LS. Provided the service temperature is at least 700oC the glass coating will form the required seal.
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Thermiculite 866 performance figures Performance Of ThermiculiteŽ 866LS

When glass is used as the sole sealing material it is well known that cracking of the seal with enhanced leakage results during thermal cycling.

This is not the case with ThermiculiteŽ 866 LS where the level of sealing is maintained during thermal cycling. Figures 6 and 7 show, under the same conditions, the sealing performance of ThermiculiteŽ 866 LS and ThermiculiteŽ 866 respectively during thermal cycles. Note scale differences of these figures.

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