Iron-based amorphous nanocrystalline composite coating with high amorphous content and preparation method thereof
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A nanocrystalline composite and iron-based amorphous technology, which is applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of difficult preparation of amorphous coating and low cooling rate of surfacing layer, and achieve simple and easy operation , good coating formation and high amorphous content
Active Publication Date: 2016-01-06
BC P INC CHINA NAT PETROLEUM CORP +1
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However, during the plasma surfacing process, the cooling rate of the surfacing layer is very low, and it is difficult to prepare an amorphous coating.
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Embodiment 1
[0029] (1) Preparation of alloy powder for plasma surfacing:
[0030] The industrially used pure metals Fe, Al, Si, Mn and the industrially used Fe-Cr-C, Fe-B, Fe-Ti alloys are divided into Fe 77.3 Cr 15.2 Al 0.6 Ti 1.1 B 4.0 C 1.0 Si 0.3 mn 0.5 , (atomic percentage, at%) for raw material configuration, after the prepared metal raw material is melted and refined in a vacuum induction furnace, the molten metal liquid is poured into an insulated crucible and sent into the atomization furnace, and enters the draft tube and Nozzle, where the melt stream is atomized by a high-pressure gas stream. The atomized metal powder solidifies and settles in the atomizing tower, and falls into the powder collecting tank;
[0031] (2) 35CrMo steel is selected as the base material, and the oxide removal and surface cleaning are carried out on the surface of the base material in sequence before plasma surfacing. Among them, the oxide removal adopts the grinding method until the metallic ...
Embodiment 2
[0036] Step (1), step (2) and step (4) are all identical with embodiment 1, only adjust the process parameter of plasma overlay welding in step (3) as follows: welding voltage 28V, welding current 150A, welding speed 40mm / min, The protective airflow speed is 12L / min, the powder feeding speed is 25g / min, and the swing range is 26mm.
[0037] Performance evaluation:
[0038]The iron-based amorphous nanocrystalline composite coating with high amorphous content prepared in Example 1 and Example 2 is evaluated by microstructure test and observation, crack resistance test, hardness test and wear resistance test respectively:
[0039] (1) The iron-based amorphous nanocrystalline composite coatings prepared in Example 1 and Example 2 can be seen from the macroscopic appearance, the coating is well formed, and the coating has no cracks; and after the coloring penetrant inspection, it is found that the coating has no cracks , indicating that the coating has good crack resistance.
[0...
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Abstract
The invention discloses an iron-based amorphous nanocrystalline composite coating with high amorphous content and a preparation method of preparing the iron-based amorphous nanocrystalline composite coating with high amorphous content by adopting a plasma surfacing method. Alloy powder which is prepared according to the specified proportion is subjected to surfacing on the surface of a base material by adopting a plasma surfacing machine to form an alloy coating, wherein the technical parameters comprise: the welding voltage is 25-30 V, the welding current is 140-190 A, the welding speed is 35-40 mm/min, the shielding gas flow is 10-12 L/min, the powder feed speed is 15-25 g/min and the amplitude of swing is 20-30 mm. when the plasma surfacing ends, after the coating is naturally cooled to the room temperature, the preparation of the iron-based amorphous nanocrystalline composite coating with high amorphous content is completed. The iron-based amorphous nanocrystalline composite coating with high amorphous content, which is prepared by the plasma surfacing method, is high in rigidity and good in wear-resisting property and can be widely applied to manufacturing and repair of metallurgical machinery and petrochemical engineering apparatuses. In addition, the coating prepared by the plasma surfacing method has the advantages that the technology is simple; the operation is simple and easy; no preheating before welding and no slow cooling after welding are needed; after surfacing, the coating has no cracks and no peeling, and the forming of the coating is excellent.
Description
technical field [0001] The invention belongs to the technical field of coating materials, in particular to an iron-based amorphous nanocrystalline composite coating with high amorphous content and a preparation method thereof. Background technique [0002] Amorphous alloys have the characteristics of short-range order and long-range disorder, uniform composition and structure, and no crystal defects, so they have excellent physical, chemical and mechanical properties such as high strength, toughness, good wear resistance and corrosion resistance. As one of the important types of amorphous alloys, iron-based amorphous alloys not only have the characteristics of general amorphous alloys, but also have excellent soft magnetic properties, and have been widely used in magnetic materials. Applications. At the same time, the most important thing is that the abundant iron resources in nature and the low vacuum degree required for the preparation of amorphous make the material cost ...
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