Graphene oxide composite iron-based alloy powder, coating preparation method and product
A graphene composite, alloy powder technology, applied in metal material coating process, coating and other directions, can solve the problems of low coating life, low strength and hardness, poor wear resistance, etc.
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[0050] In a preferred embodiment, the substrate is a steel substrate. More preferably, the substrate is a tool steel substrate. Further, the substrate is a widely used carbon tool steel substrate; the preparation method also includes a pretreatment step on the steel substrate, and the pretreatment step includes: polishing, cleaning and drying steps. Specifically, the pretreatment step includes: using a grinder to remove rust and oil stains on the surface of the carbon tool steel substrate, and polishing it with sandpaper, then washing the carbon tool steel substrate with organic solvents such as acetone and alcohol, and drying A carbon tool steel substrate is obtained to obtain a clean surface.
[0051] In one of the embodiments, the method for preparing graphene oxide composite iron-based coating by laser cladding further includes the following steps: before performing laser cladding, mixing the alloy powder uniformly, Next, vacuum insulation for 1 to 3 hours. The purpose ...
Embodiment 1
[0059] In this example, the mass proportions of the components in the alloy powder are as follows: graphene oxide: 0.3%, Ti: 5%, Cr: 8%, W: 6%, Mn: 0.9%, Ni: 6%, V: 2%, C: 1.2%, and the balance is Fe. Graphite powder is used for C with a content of 1.2%.
[0060] (1) Preparation of alloy component powder
[0061] In the alloy powder, the components other than graphene oxide are simple powders, the purity of each component is >99.5%, the particle size is 5 μm to 30 μm, and the oxygen content is <800ppm; the sphericity of the metal component powder is ≥80%.
[0062] Graphene oxide prepared by redox method to obtain graphene oxide powder, the sheet diameter of graphene oxide powder is 3 μm to 15 μm, the number of layers is 1-5 layers, the mass percentage of oxygen is 10%, and the mass percentage of sulfur is ≤0.05%.
[0063] (2) Preparation of alloy powder
[0064] The elemental powders of Ti, Cr, W, Mn, Ni, V, and C, and the graphene oxide powders were weighed according to ...
Embodiment 2
[0075] The preparation method is basically the same as in Example 1, except that the mass fraction of graphene oxide in the alloy powder is increased to 0.8%, and the corresponding mass fraction of Fe is reduced.
[0076] The mechanical properties of the prepared carbon tool steel with graphene oxide composite iron-based coating were measured, and the results are shown in Table 1.
[0077] It can be seen from Table 1 that the carbon tool steel prepared in Example 1 is better than Example 2 in terms of wear and hardness. It shows that the content of graphene oxide needs to be controlled within a certain range. When the content of graphene oxide is too high, due to the small density and large volume of graphene oxide, graphene oxide cannot evenly adhere to other element powders. On the body, it is easy to form agglomeration and reduce the mechanical properties of the coating after cladding.
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