We use Carbolite CAF D ash melting furnace. By the manual, only Gold and Palladium wires are to be used for calibration of temperature within furnace. For these metak actual melting temperatures and allowed offsets are provided - Au 1063 °C +/-5.5 °C and Pd 1554 °C +/- 5.5°C.
The wires have manufacturers catalog Nr. 20-030-000-0020 and 20-030-154-0010 and have high cost.
We are looking into finding alternative metal wires that could be used for calibration , for example
Kanthal APM https://www.kanthal.com/en/products/material-datasheets/tube/kanthal-apm/
which cost 10x cheaper compared to Au and Pd.
Are there some already tested alternatives out there?
Alloys will have a range of melting point because of the presence of solid+liquid phases, whereas pure metals and eutectic alloys will have a fixed melting point. Therefore, APMT may not be a suitable calibration material because the composition could vary batch to batch. We use pure metal wires of Cu and Ti with 4N purity for calibration purposes in the inert atmosphere. Au and Pd do not oxidize easily.
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