# US 12,110,808 B2 · Titanium alloy blade tip with high adhesion strength and wear-resistant protective coating and preparation method thereof

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,110,808 B2
- Document ID: US12110808B2
- Status: Granted
- Kind: B2
- Application number: 18/512,227
- Filed: 2023-11-17
- Published: 2024-05-23
- Granted: 2024-10-08
- Earliest claimed: 2022-11-18
- Assignees: Bgrimm Technology Group; BGRIMM Advanced Materials Science & Technology Co., Ltd.
- Applicants: BGRIMM Technology Group, Ltd.; BGRIMM Advanced Materials Science & Technology Co., Ltd.
- Inventors: Yueguang Yu; Lingfeng Huang; Jianming Liu; Shuai Wang; Xiaoliang Lu; Yinghui Cai; Rui Guo; Tong Liu; Dan Guo; Chao Wu
- Web page: https://patentgrep.com/patent/US12110808B2

## CPC

- F01D 5/288: {Protective coatings for blades}
- B05D 1/12: Applying particulate materials (B05D1/06, B05D1/10 take precedence)
- C23C 4/073: containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements
- C23C 28/022: {with at least one MCrAlX layer}
- C23C 28/3215: {at least one MCrAlX layer}
- C23C 28/324: {with at least one metal matrix material layer comprising a mixture of at least two metals or metal phases or a metal-matrix material with hard embedded particles, e.g. WC-Me}
- C25D 5/12: at least one layer being of nickel or chromium
- C25D 5/14: two or more layers being of nickel or chromium, e.g. duplex or triplex layers
- C25D 7/00: Electroplating characterised by the article coated
- C25D 15/00: Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
- F01D 11/122: {with erodable or abradable material (blades having cutting or grinding tips F01D5/20)}
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

A titanium alloy blade tip with a wear-resistant protective coating and a preparation method thereof are provided. The method includes: (1) spraying MCrAlY alloy powder on a surface of a titanium alloy blade tip by high velocity oxygen fuel (HVOF) spraying at a spraying distance of 300-400 mm to obtain the titanium alloy blade tip with a MCrAlY layer on the surface; where M is one of Ni and NiCo; (2) pre-plating Ni at a current density of 4-10 A/dm2; (3) placing the pre-plated titanium alloy blade tip in a Watt solution, covering a surface of the pre-plated titanium alloy blade tip obtained in the step (2) with abrasive particles, and then performing composite electroplating at a current density of 0.5-2 A/dm2. In the method, the wear-resistant protective coating with the high adhesion strength is prepared on the titanium alloy blade tip, and the wear-resistant protective coating has good wear resistance.

## Claims

### Claim 1

A preparation method of a titanium alloy blade tip with a wear-resistant protective coating, comprising:
step (1) spraying M-chromium-aluminum-yttrium (MCrAlY) alloy powder on a surface of a titanium alloy blade tip by a high velocity oxygen fuel (HVOF) spraying process at a spraying distance in a range of 300-400 millimeters (mm) to obtain the titanium alloy blade tip with a MCrAlY layer on the surface; wherein M is one of nickel (Ni) and nickel-cobalt (NiCo);
step (2) pre-plating Ni at a current density in a range of 6-10 amperes per square decimeter (A/dm2) on the titanium alloy blade tip with the MCrAlY layer to obtain a pre-plated titanium alloy blade tip;
step (3) placing the pre-plated titanium alloy blade tip in a Watt solution, covering a surface of the pre-plated titanium alloy blade tip obtained in the step (2) with abrasive particles, and then performing composite electroplating at a current density in a range of 0.5-2 A/dm2, so as to obtain the titanium alloy blade tip with the wear-resistant protective coating.

### Claim 2 (depends on 1)

The preparation method according to claim 1, wherein in the step (1), a thickness of the MCrAlY layer is in a range of 10-100 micrometers (μm), and a particle size of the MCrAlY alloy powder is in a range of 270-500 μm.

### Claim 3 (depends on 1)

The preparation method according to claim 1, wherein in the step (1), conditions of the high velocity oxygen fuel spraying process comprise: 40-60 grams per minute (g/min) of powder feeding rate, 16-30 liter per minute (L/min) of kerosene flow rate, and 600-1000 L/min of oxygen flow rate;
wherein in the step (2), pre-plating time is in a range of 2-6 min, and a pre-plating solution used in the pre-plating of the Ni comprises 80-160 grams per liter (g/L) of nickel chloride, 20-40 g/L of boric acid and 0-100 milliliters per liter (mL/L) of hydrochloric acid, where a content of hydrogen chloride (HCl) in the hydrochloric acid is 30-40 weight percentage (wt %).

### Claim 4 (depends on 1)

The preparation method according to claim 1, wherein in the step (1), conditions of the high velocity oxygen fuel spraying process comprise: 40-60 g/min of powder feeding rate, 20-30 L/min of kerosene flow rate, and 800-1000 L/min of oxygen flow rate;
wherein in the step (2), a pre-plating solution used in the pre-plating of the Ni comprises 120-160 g/L of nickel chloride and 36-40 g/L of boric acid.

### Claim 5 (depends on 1)

The preparation method according to claim 1, wherein in the step (3), time of the composite electroplating is in a range of 0.5-3 hours (h); the Watt solution comprises 280-350 g/L of nickel sulfate, 40-150 g/L of nickel chloride and 36-40 g/L of boric acid;
wherein a thickness of a composite coating formed in the step (3) is in a range of 5-30 μm;
wherein in the step (3), the abrasive particles are selected from at least one of cubic boron nitride, aluminum oxide, and silicon carbide; and particle sizes of the abrasive particles are in a range of 50-300 μm.

### Claim 6 (depends on 1)

The preparation method according to claim 1, further comprising:
step (4) removing unfixed abrasive particles after the composite electroplating in step (3) is completed; then filling a thickened coating of single metal or multi-metal between the fixed abrasive particles by electroplating; wherein a thickness of the thickened coating is in a range of 20-200 μm.

### Claim 7 (depends on 6)

The preparation method according to claim 6, wherein an electroplating solution used for the composite electroplating comprises 280-350 g/L of nickel sulfate, 40-150 g/L of nickel chloride and 36-40 g/L of boric acid; or the electroplating solution comprises 300-400 g/L of the nickel sulfate, 50-150 g/L of cobalt sulfate, and 36-40 g/L of the boric acid;
wherein electroplating conditions comprise: the current density is in a range of 1.5-2 A/dm2, and electroplating time is in a range of 1-4 h.