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WebDec 15, 2024 · This invention relates to a ceramic composite and to a method of making ceramic composites having superior erosion and corrosion resistance to molten metal. BACKGROUND OF THE INVENTION. In the continuous casting of molten steel a break ring is used to provide a thermal barrier at the interface between the furnace nozzle and the … WebBoron nitride is a thermally and chemically resistant refractory compound of boron and nitrogen with the chemical formula BN. It exists in various crystalline forms that are … WebJan 2, 2024 · John J. Loud obtained what is technically the first patent for a ballpoint pen, US #392,046, on 30th October 1888. A leather tanner, Harvard-educated lawyer, and inventor, Loud was born on November 2, 1844. While tanning leather, he often needed to mark a point to cut. gloucestershire community legitimacy panel