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

• Current Assignee: John C. Williams, William R. Sinclair
• Original Assignee: John C. Williams, William R. Sinclair
• Inventors: Sinclair, William R., Williams, John C.
• Application Number:
  US04/105,216
• Time in Patent Office: 631 Days
• US Class Current: 204/192.15
• CPC Class Codes: C01B 33/26 Aluminium-containing silicates , i.e. silico-aluminates
• CPC Class Codes: C01B 33/40 Clays
• CPC Class Codes: C01B 33/42 Micas ; Interstratified clay-mica products delaminated mica or vermiculite platelets obtained by a process involving cation-exchange C04B14/208
• CPC Class Codes: C01B 33/46 Amorphous silicates, e.g. so-called "amorphous zeolites" crystalline zeolites C01B39/00
• CPC Class Codes: C04B 35/18 rich in aluminium oxide
• CPC Class Codes: C04B 35/185 Mullite 3Al2O3-2SiO2
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H01C 17/12 by sputtering

Claims

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.