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EFFECT OF MAGNESIUM OXIDE CONTENT ON OXIDATION BEHAVIOR OF SOME SUPERALLOY-BASE CERMETS

机译:氧化镁含量对某些高温合金基陶瓷氧化行为的影响

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The resistance to cyclic oxidation at 1100° and 1200° C of cermets hot pressed from MgO powder (5, 10, 20, and 40 vol %) mixed with NiCrAlY, Hoskins-875, Inconel-702, or Hastelloy-X powders was determined. Cermets of MgO in NiCrAlY and MgO in Hoskins-875 were superior to cermets of MgO in Inconel-702 and MgO in Hastelloy-X in the 5- to 20-vol %-MgO range. Their oxidation resistance was reduced when the MgO content was 40 vol %. The existence of bonding between MgO and the metallic phases was observed.

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