Material performance comparison test - "Ains tantalum surface engineering technology"

Table 1 Mechanical test results

The shape of the specimens conformed to DIN 50125, testing stainless steel with a diameter of 10 mm and a CoCrMo alloy with a test diameter of 8 mm. Fabrication is done by turning, and the mechanical stress of the surface conforms to standard specifications. Tensile tests are carried out on a universal testing machine at a tensile speed of 5 mm/min. Elongation was measured with an extensometer, measuring 10 mm in length. Tensile strength, 0.2% proof stress and elongation were evaluated by these tests. It was concluded from the results in Table 1 that there was no significant change in the tensile strength or the 0.2% proof stress of the tantalum coating for either stainless steel or CoCrMo alloy.

 Figure 1 Fatigue limit test results

The maximum fatigue strength of cobalt-chromium-molybdenum changed significantly after tantalum coating. The fatigue limit of the untreated material has been tested to 550 N/mm2, and the fatigue limit of the tantalum surface-modified material has been tested to 875 N/mm2, and the fatigue strength is increased by about 60%.

Figure 2 Biocompatibility test results

The figure shows that the level of fixation is generally higher with tantalum-coated screws than with cp titanium screws. Furthermore, no significant differences between the tantalum groups were observed. There is no difference between the tantalum groups because the substrate does not affect the properties of the deposited tantalum layer.