Method for evaluating damage failure life of aluminum electrolysis cathode material
A technology of cathode material and failure life, applied in the field of materials
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Embodiment -1
[0027] Aluminum electrolytic graphite cathode material expansion and creep were measured by a modified Rapoport-Saoilenko apparatus, as figure 1 , the graphite crucible 7 is used to hold the molten electrolyte 9, a corundum insulating gasket 10 is added between the cathode sample and the bottom of the crucible for electrical insulation, and the electrolytic current flows into the cathode sample from the bottom anode conductive rod 13 and then conducts electricity from the cathode The rod 6 flows out, the high temperature required for the experiment is provided by the heating resistance wire 11 in the furnace, and the protective atmosphere flows into the furnace through the air inlet 12 to avoid oxidation of the cathode sample, graphite crucible, etc., which will affect the test accuracy. Above-mentioned test system is placed vertically on the pressurized base 14 of the testing machine, and the main body frame 15 is made of high-strength steel to ensure that the whole equipment ...
Embodiment -2
[0033] The experimental test equipment system is the same as that of Example 1.
[0034]Adopt semi-graphite cathode material, sample size, test condition embodiment 1 are identical, obtain the steady-state creep curve of semi-graphite cathode material and carry out fitting and obtain steady-state creep equation, as Figure 4 shown.
[0035] In the same manner as in Example 1, the stress-strain curve and the maximum ultimate strain ε were measured max ,Such as Figure 5 As shown, the remaining creep life of the semi-graphite cathode material is calculated by substituting it into the steady-state creep equation, as shown in Table 1.
Embodiment -3
[0037] The experimental test equipment system is the same as that of Example 1. Adopt graphite-titanium boride composite cathode material, sample size, test condition embodiment 1 are identical, obtain its steady-state creep curve and carry out fitting and obtain steady-state creep equation, as Image 6 shown. In the same manner as in Example 1, the stress-strain curve and the maximum ultimate strain ε were measured max ,Such as Figure 7 As shown, the remaining creep life is obtained by substituting into the steady-state creep linear equation of the graphite-titanium boride composite cathode material, as shown in Table 1.
[0038] The calculation and evaluation results of the electrolytic creep residual life of three different cathode materials, graphitized, semi-graphitic and graphite-titanium boride composite, show that the remaining cathode life is mainly related to its ultimate deformation capacity and steady-state creep rate. Graphite-titanium boride cathode has bette...
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