HIGH-TEMPERATURE INSULATION FOR WIRE. Period Covered: February 1, 1957 to January 31, 1958

Technical Report · Fri Jan 31 00:00:00 EST 1958

OSTI ID:4311377

Walton, J D; Harris, J N

A literature survey was undentaken to review possible methods for use in developing an electrical insulating coating for the high temperature protection of wire. Ceramic-organic contings were developed which cover the range from room temperature to 1300 F when applied directly to metal. These coatings withstand 1500 F, but a wetting problem was encountered with the enamel on metals. However, since the final ceramic organic coating is applied over a base coating of aluminum oxide the wetting problem is not expected to cause difficulty. The effect of solution of aluminum oxide in the enamel is being investigated. Curing studies have shown that methods of curing resin-frit contings is an important parameter in obtaining proper burn-out temperature of resins. Aluminum phosphnte and silica were tested briefly as possible base coatings for the final ceramicorganic coating but adherence and corrosion problems caused this work to be discontinued. Several anodizing baths have been tried, among them boric acid, oxalic acid, and sulfuric acid. Among these, sulfuric acid seems to give the best anodized coating. Application of aluminum to copper wire has been the area where the most difficulty has been encountered. Although coatings with very good adherence have been obtained, first indications were that the problem in plating seemed to be in pre-cleaning of the copper. For this reason, gold plate was applied as an initial coating in some tests prior to aluminum plating the copper. (auth)

• Research Organization: Georgia Inst. of Tech., Atlanta. Engineering Experiment Station
• DOE Contract Number: AF-33(616)-3944
• NSA Number: NSA-13-002997
• OSTI ID: 4311377
• Report Number(s): WADC-TR-58-13(Pt.I); AD-151062
• Resource Relation: Other Information: Project title: CERAMIC AND CERMET MATERIALS.; Task title: CERAMIC AND CERMET MATERIALS DEVELOPMENT. Orig. Receipt Date: 31-DEC-59
• Country of Publication: United States
• Language: English

Related Subjects

METALLURGY AND CERAMICS
ADHESION
ALUMINUM
ALUMINUM OXIDES
ALUMINUM PHOSPHATES
ANODES
BORON OXIDES
CERAMICS
CLEANING
COATING
COMBUSTION
COPPER
CORROSION
ELECTRICITY
GOLD
HIGH TEMPERATURE
MATERIALS TESTING
ORGANIC COMPOUNDS
OXALIC ACID
PLANNING
PLATING
RESINS
SILICON OXIDES
SOLUBILITY
SOLUTIONS
STABILITY
SULFURIC ACID
TEMPERATURE
THERMAL INSULATION
USES
WIRES