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Ceramic insert

  • US 4,440,534 A
  • Filed: 06/07/1982
  • Issued: 04/03/1984
  • Est. Priority Date: 04/06/1981
  • Status: Expired due to Fees
First Claim
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1. A ceramic insert for incorporation in a refractory article, the insert comprising a cylindrical body member of uniform diameter having a cavity axially inwardly of one end thereof and extending no more than half the axial distance of said body member, a thread pattern formed in the area of the body member defining said cavity, said insert formed of a mixture of 81.5% by weight Mulcoa brand refractory mix containing 60% aluminum oxide, 5% pure aluminum oxide (Al2 O3) and 13.5% raw fire clay together with 18.5% by weight phosphoric acid (H3 O4 P) so that the pure aluminum oxide will react with the phosphoric acid to precipitate as a hard salt bonding the ceramic insert to the refractory article when said refractory article is baked, a rough surface on the exterior of said cylindrical body arranged to engage said refractory article in non-slip relation when said insert is embedded therein prior to said baking.

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