How to Detect Internal Defects of Tungsten Crucible?

Due to the different maturity of manufacturing process for tungsten crucible, there are some potential problems of the finished products which are difficult to find. Wolfram crucible is mainly formed by the tungsten powder molding which requires a lot of pressure during the pressing process. With the increase of inner stress of tungsten product, the inside of wolfram crucible would crack. Therefore, after the manufacturing process of the wolfram crucible, inside of it should be carefully examined. The followings will give a brief introduction of the steps for detecting internal defects of wolfram crucible.

Phased array ultrasonic testing equipment is the essential tool for detecting internal defects of wolfram crucible which is divided into three parts, choosing the best configuration of phased array ultrasonic testing equipment to test them respectively by ultrasonic detecting. It takes a short time to finish the examination only for10 minutes, and the operation is not complicated, with a high effect that can be applied to large-scale wolfram crucible producing.

Since wall of wolfram crucible is thin with a large area, it can be detected by double crystal probe in phased array ultrasonic testing. The structure of wolfram crucible bottom is relatively simple with a smooth surface, so inspector can use a high-frequency linear probe to detect it. The structure of the junction between wolfram crucible wall and bottom of the crucible is complex, deformation surface is relatively large, so inspector can use high sensitivity test block for its detection which can detect the smallest equivalent of 0.2mm hole.

Because of the particularity of the manufacturing process of the wolfram crucible, it would cause instable quality of wolfram crucible. The inside of wolfram crucible is easy to have cracks, holes and other defects. If it cannot be noticed in time which would cause further more severe crack during application or lead to a wolfram crucible burst, even result in serious accidents. Therefore, the detection of internal defects of finished wolfram crucible is necessary. Detecting by this method can ensure quality of product, and the detection result of the method is more intuitive, the cost of the process is low and it’s suitable for large-scale industrial production of wolfram crucible. Quality of wolfram crucible directly determines the quality of the follow-up work. Development of testing technology for nondestructive wolfram crucible has a great significance for industry. People should think highly of its applications.

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