Evaluation method of mixing uniformity of composite powder

An evaluation method of mixing uniformity of composite powder, including the following steps:

• S1, determining raw materials of composite powder to be evaluated and a mass ratio of each raw material according to the composite powder to be evaluated;
• S2, mixing the raw materials according to the mass ratio to obtain multiple standard composite powders with different mixing times, wherein a mixing time difference between any two adjacent standard composite powders according to the mixing time from small to large is not be less than 30 s and not more than 3 min;
• S3, determining the flow energy of each standard composite powder;
• S4, analyzing and comparing the flow energy of the multiple standard composite powders by a significant difference method, determining at least 3 consecutive standard composite powders with no significant difference in the flow energy according to the mixing time from small to large, defining each of the at least 3 consecutive standard composite powders as uniform-mixed standard composite powder, calculating an average value of the flow energy of the uniform-mixed standard composite powders, and record the average value as standard flow energy:
• TFEs;
• S5, determining the flow energy of the composite powder to be evaluated:
• TFEd, calculating a percentage difference P·Vds between TFEd and TFEs according to P·Vds=|(TFEd−TFEs)|/TFEs*100, and evaluating the mixing uniformity of the composite powder according to P·Vds;
• wherein a specific preparation method of each standard composite powder in S2 includes:
• placing the raw materials according to the mass ratio in a Turbula three-dimensional mixer, and mixing it for preset time, wherein a mixing speed is 22-96 rpm;
• wherein evaluating the mixing uniformity of the composite powder according to the P·Vds includes:
• if P·Vds does not exceed 5%, the composite powder to be evaluated is determined to be uniformly mixed.