Machinable oxide ceramic

Patent · Tue Jun 01 04:00:00 EDT 1993

OSTI ID:6400093

Rayne, R J; Toth, L E; Jones, L D; Soulen, Jr, R J; Bender, B A

A method of forming a machinable bulk superconductor by melt-casting the described comprising the steps of: weighing out amounts of powdered SrCO[sub 3], CuO, CaCO[sub 3], and Bi[sub 2]O[sub 3] for the desired stoichiometry of the superconductor; combining the amounts of Bi[sub 2]O[sub 3], SrCO[sub 3], CuO and CaCO[sub 3] to form a mixture of uniform color; removing the carbonates in the mixture; heating the mixture until the mixture melts completely, to form a melt; pouring the melt into a preheated, non-reactive mold; cooling the melted mixture in the mold to room temperature, to form a casting; inducing a superconducting phase having randomly oriented platelets within the casting; and machining, by a metal cutting technique, said casting having said induced superconducting phase; wherein said machining step is performed with a steel tool.

• Assignee: Secretary of the Navy, Washington, DC (United States)
• Patent Number(s): A; US 5215961
• Application Number: PPN: US 7-543132
• OSTI ID: 6400093
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CASTING
CERAMICS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DISPERSIONS
FABRICATION
HIGH-TC SUPERCONDUCTORS
MACHINING
MATERIALS WORKING
MIXTURES
OXIDES
OXYGEN COMPOUNDS
STOICHIOMETRY
STRONTIUM CARBONATES
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS