# US 11,027,334 B2 · Micro-nano composite powder dedicated for laser repair of tiny cracks in stainless steel surface

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- Number: US 11,027,334 B2
- Document ID: US11027334B2
- Status: Granted
- Kind: B2
- Application number: 16/076,816
- Filed: 2017-05-04
- Published: 2019-01-17
- Granted: 2021-06-08
- Earliest claimed: 2016-11-24
- Assignees: Dalian University of Technology
- Applicants: Dalian University of Technology
- Inventors: Wei Jiang; Xianfeng Jiang; Yinyin Li
- Web page: https://patentgrep.com/patent/US11027334B2

## CPC

- B22F 1/12: Metallic powder containing non-metallic particles (containing lubricating or binding agents or organic material B22F1/10)
- B22F 1/052: characterised by a mixture of particles of different sizes or by the particle size distribution
- B22F 1/0545: Dispersions or suspensions of nanosized particles
- B22F 1/09: {Mixtures of metallic powders}
- B23P 6/04: Repairing fractures or cracked metal parts or products, e.g. castings
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/40: with nickel
- C22C 38/44: with molybdenum or tungsten
- C23C 24/103: {Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides}
- B22F 2007/068: {repairing articles}
- B22F 2301/15: Nickel or cobalt
- B22F 2301/35: Iron
- B22F 2301/40: Intermetallics other than rare earth-Co or -Ni or -Fe intermetallic alloys
- B22F 2302/10: Carbide
- B22F 2302/253: Aluminum oxide (Al2O3)
- B22F 2304/054: Particle size between 1 and 100 nm
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)

## Abstract

A micro-nano composite powder dedicated for laser repair of tiny crack on stainless steel surface, includes 3 wt %-7 wt % of nano-WC, 0.5 wt %-2 wt % of nano-Al2O3, 0.2 wt %-0.8 wt % of micro-V powder and the balance of micro stainless steel powder. The stainless steel powder includes 0.08 wt % of C, 0.5 wt % of Si, 1.46 wt % of Mn, 0.03 wt % of P, 0.005 wt % of S, 19 wt % of Cr, 9.5 wt % of Ni, 0.5 wt % of Mo and the balance of Fe. The micro and nano powders are mixed through ball milling and mixed with anhydrous ethanol. The composite powder is suitable for laser repair of tiny crack on the surface of stainless steel part with high toughness requirement. After laser repair, the composite powder can be fused with the substrate, the repaired layer and the substrate are metallurgically bonded at the interface, the repaired layer contains fine grains, and therefore the compatibility and fracture property of the repaired layer are improved.

## Claims

### Claim 1

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces, wherein the composite powder comprises 3 wt %-7 wt % of nano-WC, 0.5 wt %-2 wt % of nano-Al2O3, 0.2 wt %-0.8 wt % of micro-V powder and the balance of micro stainless steel powder, wherein the micro and nano powders are fully mixed through ball milling and further uniformly mixed after being blended with anhydrous ethanol; the stainless steel powder comprises 0.08 wt % of C, 0.5 wt % of Si, 1.46 wt % of Mn, 0.03 wt % of P, 0.005 wt % of S, 19 wt % of Cr, 9.5 wt % of Ni, 0.5 wt % of Mo and the balance of Fe.

### Claim 2 (depends on 1)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces claim 1, wherein the nano-WC powder has a particle diameter of 50-80 nm and a purity of 99.99%.

### Claim 3 (depends on 1)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces of claim 1, wherein the nano-Al2O3 powder has a particle diameter of 30-50 nm and a purity of 99.99%.

### Claim 4 (depends on 1)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces of claim 1, wherein the stainless steel powder has a particle diameter of 30-50 μm and a purity of 99.9%.

### Claim 5 (depends on 3)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces of claim 3, wherein the stainless steel powder has a particle diameter of 30-50 μm and a purity of 99.9%.

### Claim 6 (depends on 1)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces of claim 1, wherein the V powder has a particle diameter of 20-50 μm and a purity of 99.9%.

### Claim 7 (depends on 3)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces of claim 3, wherein the V powder has a particle diameter of 20-50 μm and a purity of 99.9%.

### Claim 8 (depends on 4)

A micro-nano composite powder dedicated for the laser repair of tiny cracks on stainless steel surfaces of claim 4, wherein the V powder has a particle diameter of 20-50 μm and a purity of 99.9%.