Process for producing a rotary anode and the anode produced by such process

Abstract

The present invention is directed to an improved process for manufacturing a rotary anode for an x-ray tube, said rotary anode comprising a molybdenum support member on which a target layer consisting essentially of tungsten or a tungsten-rhenium alloy is provided by plasma spraying, the improvement comprising: a) preheating the support member to a temperature of from 1150° C. to 1600° C., b) placing the support member in a gaseous atmosphere containing hydrogen and having a pressure of from 0.5 to 0.9 bars and wherein hydrogen is present in a molar ratio of hydrogen to tungsten dioxide of from 5:1 to 50:1, and c) plasma spraying the target layer onto the support layer in said gaseous atmosphere. The invention is also directed to the anode produced by the process.

1 . In a process for manufacturing a rotary anode for an x-ray tube, said rotary anode comprising a molybdenum support member on which a target layer consisting essentially of tungsten or a tungsten-rhenium alloy is provided by plasma spraying, the improvement comprising:
 a) preheating the support member to a temperature of from 1150° C. to 1600° C.,   b) placing the support member in a gaseous atmosphere containing hydrogen and having a pressure of from 0.5 to 0.9 bars and wherein hydrogen is present in a molar ratio of hydrogen to tungsten dioxide of from 5:1 to 50:1, and   c) plasma spraying the target layer onto the support layer in said gaseous atmosphere.   
     
     
         2 . The process of  claim 1 , wherein the support member is preheated to a temperature of from 1300° C. to 1500° C. 
     
     
         3 . The process of  claim 1 , wherein said pressure is from 0.7 to 0.9 bars. 
     
     
         4 . The process of  claim 1 , wherein said ratio is from 10:1 to 30:1. 
     
     
         5 . The rotary anode produced according to the process of  claim 1 .