| 摘要 |
1,130,995. Sintered tungsten - copper - titanium composites. MALLORY METALLURGICAL PRODUCTS Ltd. March 7, 1967 [March 11, 1966], No. 10586/67. Heading C7D. An infiltrated W-Cu-Ti composite suitable for use as a contact material in vacuum and electrical switching devices is made by infiltrating a W powder compact with a Cu-Ti alloy. A W powder, particle size 1 to 10 microns, is compacted at 20 to 35 t. s. i. and may optionally be presintered at 1250‹C. in hydrogen prior to infiltration with a Cu-Ti alloy containing 0À05 to 0.5% Ti, alternatively the green W compact may be infiltrated. Infiltration is carried out in a vacuum of 10<SP>-5</SP> Torrat 1200‹-1450‹C. for 20 to 60 minutes. In an alternative embodiment the W may be coated with Ti either by electrolysis or vapour deposition and then infiltrated with Cu, the amount of Ti coating being sufficient to produce a Cu-Ti alloy containing 0.05 to 0.5% Ti. |
