Cause of Tungsten Tube Surface Transverse Cracks

After the removal of the deposition matrix or vacuum annealing treatment, the subsequent cooling process is not well controlled, it leads to the generation of transverse cracks on the deposition layer surface which along the vertical axial direction of tungsten tube.

Cause of tungsten tube surface transverse cracks as follows:

During cooling deposition, the deposition substrate shrink which would lead to the deposition of tungsten tube generate uneven deformation and subsequent release of residual stress.

When cooling deposition is completed, the deposition matrix contraction will cause the adjacent tungsten atoms deformed. As the further deformation of tungsten tube decreases, elastic deformation occurs.

After removing the deposit matrix, the gradual release of elastic deformation in tungsten tube inside will change the state of the surface stress, resulting in residual compressive stress decreases and even turn into the residual tensile stress. When the residual tensile stress exceeds the strength to withstand, depositing tungsten tube surface will produce transverse cracks.

 

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