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Mullite synthesis

  • US 3,073,770 A
  • Filed: 04/24/1961
  • Issued: 01/15/1963
  • Est. Priority Date: 04/24/1961
  • Status: Expired due to Term
First Claim
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1. A METHOD FOR THE PREPARATION OF MULLITE OF NEEDLE CRYSTALLINE HABIT WHICH COMPRISES THE STEPS OF SPUTTERING 04A SILICON-ALUMINUM ALLOY UPON A SUBSTRATE IN THE PRESENCE OF OXYGEN AT A PRESSURE WITHIN THE RANGE OF 10 TO 50 MICRONS OF MERCURY AND A VOLTAGE OF AT LEAST 30 VOLTS, THEREBY FORMING AN OXIDIZED FILM HAVING A COMPOSITION WITHIN THE RANGE OF 72-78% AL2O3, REMAINDER SIO2 OF THE SILICON-ALUMINUM ALLOY AND, SUBSEQUENTLY HEATING THE SAID OXIDIZED FILM AT A TEMPERATURE WITHIN THE RANGE OF 1000 TO 1500* C. FOR A TIME PERIOD OF APPROXIMATELY 1 TO 2 HOURS THEREBY CONVERTING THE OXIDIZED FILM INTO MULLITE OF NEEDLE CRYSTALLINE HABIT.

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