mg-gd-zn(-ca) medical magnesium alloy with lpso structure and preparation method thereof
A magnesium alloy and alloy technology, applied in the field of low-alloyed medical magnesium alloy and its preparation, can solve the problems of high content of rare earth elements, excessively fast degradation rate, uneven degradation, etc., and achieve improved mechanical properties, simple process and low price Effect
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[0034] The preparation method of the Mg-Gd-Zn(-Ca) medical magnesium alloy with LPSO structure of the present invention comprises the following steps in sequence:
[0035] (1) Smelting: first heat the crucible to 400°C and start introducing CO 2 and SF 6 A protective gas with a flow ratio of 99:1 is used, and then the high-purity magnesium ingot (purity greater than 99.95%) is put into the crucible. When the high-purity magnesium is completely melted and the temperature is raised to 760 °C, the Mg-Gd master alloy (impurity content is less than 0.05%) is added, After it is completely melted, add pure Zn (purity greater than 99.995%) and Mg-Ca master alloy (impurity content less than 0.05%), when the raw materials are completely melted, turn on the automatic stirrer and stir for 4-8 minutes, and then set the temperature to After standing at 700°C for 10-20 minutes, it is cast into a steel mold with a cooling system under the protection of protective gas, and the cooling rate of...
Embodiment 1
[0040] Using high-purity magnesium (the purity of Mg is greater than or equal to 99.95%), Mg-Gd master alloy (the impurity content is less than 0.05%) and pure zinc (the purity of Zn is greater than or equal to 99.995%) as raw materials, according to Mg-3.0Gd-0.8Zn (quality fraction) alloy composition ratio for smelting. When smelting, first heat the crucible to 400 ℃ and start to pass CO 2 and SF 6 The protective gas with a flow ratio of 99:1, and then put the high-purity magnesium ingot into the crucible. When the high-purity magnesium is completely melted and the temperature rises to 760 °C, add the Mg-Gd master alloy. After it is completely melted, add pure Zn. When the raw material is completely melted After that, turn on the automatic stirrer and stir for 5 minutes, then set the temperature to 700 °C and let it stand for 10 minutes, then cast it into a steel mold with a cooling system under the protection of protective gas, and control the cooling rate of the ingot at 4...
Embodiment 2
[0042] Using high-purity magnesium (the purity of Mg is greater than or equal to 99.95%), Mg-Gd master alloy (the impurity content is less than 0.05%), pure zinc (the purity of Zn is greater than or equal to 99.995%) and Mg-Ca master alloy (the impurity content is less than 0.05%) ) as the raw material, smelting according to the composition ratio of Mg-3.0Gd-0.8Zn-0.6Ca (mass fraction) alloy. When smelting, first heat the crucible to 400℃ and start to pass CO 2 and SF 6 The protective gas with a flow ratio of 99:1, and then put the high-purity magnesium ingot into the crucible. When the high-purity magnesium is completely melted and the temperature rises to 760 °C, add the Mg-Gd master alloy. After it is completely melted, add pure Zn, and then add Mg- Ca master alloy, when the raw material is completely melted, turn on the automatic stirrer to stir for 6 minutes, then set the temperature to 700 ℃ and let it stand for 10 minutes, and then cast it into a steel mold with a cool...
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