Method for manufacturing CRT interior parts

Details Method for manufacturing CRT interior parts Method for manufacturing CRT interior parts

1996-12-02

1999-05-11

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148283, 148287, 4284721, C23C8/04

Patent

active

059024186

ABSTRACT:
A method for manufacturing CRT interior parts made of material such as of iron or steel has the steps of: introducing hydrocarbon and air into a conversion furnace, thereby producing an exothermic gas; cooling the exothermic gas to a predetermined temperature higher than a dew point of the exothermic gas; and introducing the exothermic gas at a temperature higher than the dew point into a blackening furnace which houses the CRT interior parts, thereby producing a blackened film on a surface of each of the CRT interior parts. The blackened film is mainly consisting of Fe.sub.3 O.sub.4. The temperature of the exothermic gas, when introduced in the blackening furnace, may be higher than a boiling point of each component composing the exothermic gas.

REFERENCES:
patent: 4035200 (1977-07-01), Valentijn
patent: 4294436 (1981-10-01), Takahashi
patent: 4692659 (1987-09-01), Takenaka et al.
patent: 4992113 (1991-02-01), Baldo et al.
patent: 5167557 (1992-12-01), Teramoto et al.

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