Patent ID: 9477048
Filing Date: 2016-10-25
CPC Classification: B28B,B30B,C04B,G02B

Claim Text:
1. A method of manufacturing a sleeve for optical communication apparatus, comprising the steps of: forming a cylindrical sleeve having an inner peripheral surface by press-forming a powder of a ceramics raw materials added binder therein; pressing the cylindrical sleeve to 200 MPa and a water pressure being maintained for two minutes by a cold isostatic pressing apparatus to eliminate variation of a density distribution of the ceramics raw materials in the cylindrically formed sleeve; degreasing the cold isostatic pressed cylindrical sleeve by application of a firing treatment at a temperature of 400 to 500° C. for a predetermined time to obtain a cylindrical sleeve decreased and to eliminate binders therein where a portion where the binders existed between the ceramic raw materials becomes a void; and heating and firing the degreased cylindrical sleeve subsequently conducted with firing treatment at a temperature of 1300 to 1500° C. within a predetermined time to reduce a surface roughness R