具有永久性线性变化异常的热绝缘浇注料 案例研究

This technical report documents an observed anomaly with the permanent linear change (PLC) of insulating castables with a density less than 1280 kg/m3 (80 pcf). The curing time is shown to impact the permanent linear change when samples are subsequently fired to 816 °C (1500 °F). The sample preparation and testing were performed by an independent laboratory on behalf of the API Refractory Projects Group. Disclaimer: This report only reviews the data from one castable material, which was only tested by one laboratory. Therefore, it may not be conclusive that this anomaly is applicable to all castables with a density less than 80 pcf. While originally adapted from fired refractory brick testing, it should be noted that PLC has been a longstanding physical property measurement for castables to monitor and control the permanent linear shrinkage. Over this extended period of commercial practice, the test has proven to be an effective tool to monitor excessive shrinkage cracking during ini