Compositions involving V sub 2 O sub 3 -ZrO-TlO sub 2

Patent · Tue Jun 04 04:00:00 EDT 1991

OSTI ID:5646064

Muan, A; Najjar, M S

This patent describes a method of preparing compositions, from V{sub 2}O{sub 3}, ZrO{sub 2} and TiO{sub 2} that fall within the shaded area circumscribed by ABCDF as shown in the disclosed figure. It comprises heating V{sub 2}O{sub 5} powder having a particle size of less than about 50 microns in an atmosphere in which the partial pressure of oxygen is in the range of 10{sup {minus}8} to 10{sup {minus}10} atmospheres while gradually increasing the temperature over a temperature range of about 600{degrees}C to 1300{degrees}C for a period to ensure complete reduction of all vanadium to V{sup 3+}; heating TiO{sub 2} and ZrO{sub 2} powders each having a particle size of less than about 50 microns for a period of about 10 to 14 hrs. at a temperature in the range of about 600{degrees}C to 800{degrees}C for TiO{sub 2} and about 1000{degrees}C to 1200{degrees}C for ZrO{sub 2}; thoroughly grinding together about 24 to 98 wt. The author of V{sub 2}O{sub 3} with about 2 to 50 wt % of ZrO{sub 2} and about 0 to 66 wt % of TiO{sub 2} to produce a mixture having a grain size of less than about 50 microns; pelletizing the mixture at a pressure of about 5,000 psi; and heating and reacting together the pellets at a temperature in the range of about 1100{degrees}C to 1700{degrees}C for a period in the range of about 12 to 48 hrs. in an atmosphere in which the partial pressure of oxygen is in the range of 10{sup {minus}10} to 10{sup {minus}5} atmosphere. This patent also describes compositions produced from V{sub 2}O{sub 3}, ZrO{sub 2} and TiO{sub 2}, wherein the compositions are solid solutions and fall within the shaded area circumscribed by ABCDF as shown wherein the amounts of V{sub 2}O{sub 3}, ZrO{sub 2} and TiO{sub 2} are characterized.

• Assignee: Texaco Inc., White Plains, NY (USA)
• Patent Number(s): A; US 5021386
• Application Number: PPN: US 7-496848
• OSTI ID: 5646064
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
ELEMENTS
HEAT TREATMENTS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
PARTICLE SIZE
POWDERS
SIZE
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES