Preparation method of W-Cu functionally graded material
A technology of functionally graded materials and functionally graded materials, which is applied in the field of preparation of W-Cu functionally graded materials, can solve the problems of many closed cells and poor tissue uniformity, achieve regular particle shape, narrow particle size distribution, and overcome tissue inhomogeneity Effect
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[0017] A kind of preparation method of W-Cu gradient function material of the present invention, specifically implement according to the following steps:
[0018] The preparation of step 1, W powder:
[0019] Using a fluidized bed jet mill to jet mill W to obtain monodisperse, nearly spherical W powders with different particle sizes and narrow particle size distribution;
[0020] Step 2. Select W powder, prepare a gradient green body by dry powder laying method, and sinter the gradient green body to obtain a gradient porous W skeleton:
[0021] Select W powder with a D50 of 3-35 μm and a dispersion of particle size distribution less than 1 as the raw material, and use the dry powder lay-up method to prepare the gradient green body, and carry out powder lay-up according to the density from large to small after the same sintering temperature, and the number of lay-up layers It has 3 to 5 layers, and after sintering at 1400-1800°C, a gradient porous W skeleton is obtained. The p...
Embodiment 1
[0026] A kind of preparation method of W-Cu graded function material, specifically implement according to the following steps:
[0027] Step 1, using a jet mill to disperse and classify commercial W with different Fibonacci particle sizes to obtain nearly spherical W powder with a narrow particle size distribution;
[0028] Step 2. Select powders with D50 of 5+25μm, 20μm, 10μm and 5μm to laminate and press the green body, and sinter the green body at 1800°C to obtain a gradient porous W skeleton. The porosity of the W skeleton varies from 25% to 62%. ;
[0029] Step 3. Infiltrate the prepared gradient porous W skeleton with Cu. The infiltration temperature is 1250° C., the holding time is 2 hours, and high-purity hydrogen gas is continuously introduced during the infiltration process to finally obtain Cu with a variation of 15wt% to 43wt%. W-Cu functionally graded material, its relative density is 98%.
Embodiment 2
[0031] A kind of preparation method of W-Cu graded function material, specifically implement according to the following steps:
[0032] Step 1, using a jet mill to disperse and classify commercial W powders with different Fibonacci particle sizes to obtain nearly spherical W powders with narrow particle size distribution;
[0033] Step 2. Select 3μm+15μm mixed powder, 8μm+35μm mixed powder and 5μm powder to lay up and press the green body, and sinter the green body at 1600°C to obtain a gradient porous W skeleton. The porosity of the W skeleton is from 15% to 70%. Variety;
[0034] Step 3. Infiltrate Cu into the prepared gradient porous W skeleton, the infiltration temperature is 1350°C, the holding time is 3h, and high-purity hydrogen is continuously introduced during the infiltration process. Chen Zheng:
[0035] Finally, a W-Cu functionally graded material with a Cu content varying from 8wt% to 50wt% was obtained, and its relative density was 98.2%.
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