Development of Cold Spray and the Current Research Status at Home and Abroad

The concept of cold spraying was proposed in 1990, originating from experiments conducted in the mid-1980s at a Soviet research institute. During supersonic wind-tunnel tests using tracer particles, researchers observed that when the particle velocity exceeded a certain critical threshold, the interaction between the tracer particles and the target surface shifted from erosion to accelerated deposition.

U.S. Cold Spray Technology Used to Refurbish Aging Bombers

South Dakota School of Mines & Technology and Ellsworth Air Force Base have signed a formal partnership to jointly undertake project research aimed at modernizing aging bombers. To date, four B-1 bombers have been refurbished, enabling them to remain in service and saving the military millions of dollars.

The U.S. Air Force is evaluating two cold spray processes.

The U.S. Air Force Research Laboratory has recently, through evaluation, validated two cold-spray deposition technologies that make it possible to apply tungsten carbide–cobalt (WC-Co) coatings to high-strength steel components in aircraft. If subsequent tests are successful, these technologies could serve as an alternative to electroplated hard chrome (EHC).

Because the particle temperature is relatively low during cold spraying, the powder is less likely to undergo oxidative phase transformations. As a result, the microstructure of the coating formed is essentially unchanged compared to that of the powder before spraying. Therefore, a wide variety of powders—such as pure metal powders, alloy powders, and composite coatings—can be used in cold spraying, enabling the production of coatings with diverse properties.

Papermaking dryer cylinder spray coating processing

On-site Supersonic Spraying for Papermaking Dryers ★ On-site supersonic spraying of stainless steel alloys onto dryers, followed by precision grinding and polishing. ★ Reinforcement of new dryers with supersonic arc-sprayed nickel-chromium-boron wear-resistant alloys. ★ Spraying on the inner and outer walls of papermaking steam drums, coating rollers, and calendering rollers. ★ On-site brush plating repair and mirror-polishing of dented and corroded dryer cylinders. On-site Spraying for Dryers Spraying for Calendering Rollers New Dryer Reinforcement via Spraying; Coating Roller Repair via Brush Plating VOITH Paper Machine Cylinder Production Line Spraying Construction VOITH Paper Machine Cylinder Production Line Spraying Construction VOITH Paper Machine Cylinder Production Line Spraying Construction High-speed sanitary paper machine new dryer cylinder spraying Typical customer base: Ningbo Zhonghua Paper Co., Ltd., Guangzhou Paper Group Co., Ltd., Guangdong Zhongshun Paper Industry Fuyang Huayu Paper Co., Ltd. Dongguan Liwen Paper Mill, Guangdong Dongguan Jianhui Paper Co., Ltd., Guangdong, Zhuhai Hongta Paper Co., Ltd. Providing complete dryer cylinder spraying equipment and technical consulting services; local repair and brush-plating equipment and technical consulting services for dryer cylinders.

Non-standard manufacturing of various wear-resistant and corrosion-resistant shaft sleeves for chemical pumps.

Non-standard custom-made various wear-resistant mechanical seals and chemical pump shaft sleeves.

Non-standard custom manufacturing of highly wear-resistant mechanical components and special-shaped parts.

Tungsten carbide spray-coated wire-drawing tower, wire-drawing cylinder spray coating processing, and wear-resistant spray coating processing for take-up reels.

By employing the supersonic flame spraying process to coat the surfaces of parts such as drawing machine tower pulleys, guide pulleys, wire-drawing cylinders, winding reels, and guide grooves with tungsten carbide ceramic coatings, the surface hardness can reach HRc75—significantly higher than the wear resistance of tool steels or chilled cast irons.