Firing and Drying

Product Profile: Disc Debut

Mantec Technical Ceramics develops process control discs for thermal monitoring and controlling.

Mantec Technical Ceramics recently introduced high-temperature Bullers™ process control discs. These new discs can ensure a uniform and controlled heatworkMantec Technical Ceramics profile in thermal monitoring and controlling.

Mantec reports increased interest in higher temperature versions of the discs—manufactured to ISO 9001:2008 quality standards—since they were introduced. The company now offers the BPCD-HT version for firing/sintering temperatures between 1200°C and 1550°C, and BPCD-VHT, covering 1500°C up to 1770°C.

As with Bullers Rings, accurate and reliable pyrometry is guaranteed because the ceramic discs experience the same thermal effects as the payload. So, for any particular point in any zone, measuring the disc shrinkage after firing/sintering will tell the user exactly what quantity of heat—from all sources—has been absorbed through the kiln, furnace or oven cycle.

Both the BPCD-HT and BPCD-VHT discs are 20 mm in diameter by 7 mm thick, allowing them to be used in a host of high-temperature and ultra-high-temperature combustion environments, including small footprint sintering and test furnaces. They are reportedly simple to use because they are easily placed and quick to measure. After the firing process, the operator uses a micrometer to measure the outside diameter of the disc and note whether there are any changes to that diameter from the norm. Here, Mantec’s discs provide an advantage to the user and speed up the process; other products might require a temperature correlation chart or calibration curve, which has to be issued with each set of discs supplied to the customer. The user must read off this new chart each time after making measurements.

Mantec, however, has developed the required technology to manufacture its discs to a set of consistent principles and keep them harmonized against internal standards for any of its given temperature ranges. The company makes the smallest of changes to the discs to ensure that they perform to this established standard. This means that there is just one standard temperature correlation chart for the BPCD-HT and one for the BPCD-VHT.

“Heatwork evaluation is vital in all technical ceramic manufacturing processes, and there are very few pyrometry products on the market that offer consistent and accurate measurement up to 1770°C,” said Adrian Wake, sales manager. “Product quality can easily be compromised if this evaluation process is not carried out and association with peak firing temperatures is not being monitored and controlled.

“Early reaction to our HT and VHT discs has been extremely encouraging—customers have recognized that our closely controlled manufacturing technique has made life a lot easier for them, in addition to which the discs are very competitively priced. They help maximize yields, increase productivity, minimize waste and improve profitability. Each batch of materials is pre-tested to our exacting standards before discs are manufactured. This consistency ensures a reliable, consistent and reproducible product quality time after time.” 

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