Composition involving NiO-V sub 2 O sub 2 TiO sub 2

Patent · Tue Jul 30 04:00:00 EDT 1991

OSTI ID:5646446

Muan, A; Najjar, M S

This patent describes a method of preparing compositions from NiO, V{sub 2}O{sub 3} and TiO{sub 2} wherein the compositions fall within the shaded area circumscribed by ABCDE. 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 10-10 atmospheres while starting at a temperature of 600{degrees} C.; separately heating TiO{sub 2} and NiO powders each having a particle size of less than about 50 microns for a period of about 600{degrees} C. to 800{degrees} C. for TiO{sub 2} and about 700{degrees} C. to 1000{degrees} C. for NiO; thoroughly grinding together about 14 to 98 wt. % of V{sub 2}O{sub 3} with about 0 to 66 wt. % of TiO{sub 2} and about 2 to 60 wt. % of NiO 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 900{degrees} C. to 1600{degrees} C. for a period in the range of about 1/2 to 48 hours. This patent also describes compositions produced from NiO, V{sub 2}O{sub 3} and TiO{sub 2}, wherein the compositions are solid solutions and fall within the shaded area circumscribed by ABCDE as shown in the disclosed FIGURE wherein the amounts of NiO, V{sub 2}O{sub 3} and TiO{sub 2} are characterized.

• Assignee: Texaco Inc., White Plains, NY (USA)
• Patent Number(s): US 5036038; A
• Application Number: PPN: US 7-507803
• OSTI ID: 5646446
• 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
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
COMMINUTION
DISPERSIONS
ELEMENTS
FABRICATION
GRINDING
HEAT TREATMENTS
MACHINING
MIXTURES
MOLDING
NICKEL COMPOUNDS
NICKEL OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
PARTICLE SIZE
PELLETIZING
POWDERS
SIZE
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES