Neodymium iron boron magnet surface flame spray welding layer and preparation method thereof
A flame spray welding, NdFeB technology, used in the manufacture of permanent magnets, magnetic objects, inductors/transformers/magnets, etc. Abrasion and corrosion resistance, high hardness effect
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Embodiment 1
[0036] The concrete preparation steps of flame spray welding layer in the present embodiment are as follows:
[0037] S1. Magnet surface pretreatment:
[0038] A commercial block-shaped sintered NdFeB magnet (state: unmagnetized, brand: 38UH) with a size of 18×12×4mm was selected for the test. Process parameters of chamfering treatment: chamfering treatment in a rolling mill for 5 hours; then use 100-mesh brown corundum to perform sand blasting treatment on the chamfered magnet, the sand blasting angle is 45°, and the sand blasting time is 2 minutes; then use mass The magnet after sand blasting was pickled with dilute nitric acid with a fraction of 3% for 10s; finally, the magnet after pickling was ultrasonically washed and preheated at 200°C.
[0039] S2, preparation of spray welding powder:
[0040] Spray welding powder is nickel-based self-fluxing alloy powder mixed with nano-titanium carbide. Among them, the particle size of nanoparticles is 50nm; the particle size of n...
Embodiment 2
[0046] The concrete preparation steps of flame spray welding layer in the present embodiment are as follows:
[0047] S1. Magnet surface pretreatment:
[0048] A commercial block-shaped sintered NdFeB magnet (state: unmagnetized, brand: 38UH) with a size of 18×12×4mm was selected for the test. Process parameters of chamfering treatment: chamfering treatment in a rolling mill for 5 hours; then use 150-mesh brown corundum to perform sand blasting treatment on the chamfered magnet, the sand blasting angle is 60°, and the sand blasting time is 3 minutes; then use mass The magnet with a fraction of 4% is acid-washed for 15s after sand blasting; finally, the magnet after pickling is ultrasonically washed and preheated at 250°C.
[0049] S2, preparation of spray welding powder:
[0050] Spray welding powder is nickel-based self-fluxing alloy powder mixed with nano-tungsten carbide. Among them, the particle size of nanoparticles is 75nm; the particle size of nickel-based self-fluxi...
Embodiment 3
[0056] The concrete preparation steps of flame spray welding layer in the present embodiment are as follows:
[0057] S1. Magnet surface pretreatment:
[0058] A commercial block-shaped sintered NdFeB magnet (state: unmagnetized, brand: 38UH) with a size of 18×12×4mm was selected for the test. Process parameters of chamfering treatment: chamfering in a rolling mill for 5 hours; then use 200-mesh brown corundum to perform sand blasting on the chamfered magnet, the sand blasting angle is 75°, and the sand blasting time is 4 minutes; then use mass Dilute nitric acid with a fraction of 5% pickled the magnet after sand blasting for 20s; finally, after ultrasonic washing the magnet after pickling, preheated at 300°C.
[0059] S2, preparation of spray welding powder:
[0060] Spray welding powder is nickel-based self-fluxing alloy powder mixed with nano-silicon carbide. Among them, the particle size of nanoparticles is 100nm; the particle size of nickel-based self-fluxing alloy po...
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