Coating & Surface TreatmentLINSPRAY global coating solutions

Linde engineers are among the most knowledgeable in the world when it comes to gas-enabled applications. Here you will find a wealth of information on the process innovations and application expertise they have brought to Coating & Surface Treatment. Simply click on the applications and discover how we can help you meet your quality, efficiency and optimization targets.

Coating Technologies

Thermal spray coating technologies employ two types of energy to spray coatings: thermal energy and kinetic energy. Both of these energies are generated through gases. Well established high temperature processes are flame, HVOF, plasma and arc spraying. 

Linde’s LINSPRAY® product offering serves the unique needs of the coating industry by providing gases and safe gas supply solutions for these processes. In addition, Linde constantly develops technologies that can further enhance your coating process. One of these technologies is in process CO2 cooling, another is high pressure Cold Spraying,

LINSPRAY® - CO2 cooling 

The LINSPRAY® CO2 cooling kit was developed for use in conjunction with thermal spraying but it is also ideal for temperature control during grinding, welding and machining.  The portable kit consist of a CO2 withdrawal valve, safety relief valve, a high-pressure hose, two solenoid valves with a fine filters, numerous expansion nozzles and a control panel. Various nozzle sizes are available to suit individual application needs.
The nozzles discharge a mixture of cold CO2 gas and snow. CO2 is the most effective dry cooling agent. CO2 snow is also a highly effective cleaning agent. Special CO2 nozzles have been developed to enable uniform, directed and continuous cooling results without plugging. 

Cold Spray 

The desire for dense, oxide free layers has led to Cold Gas Spraying. In cold spraying, the kinetic energy (particle velocity) is increased and the thermal energy reduced. In this way it is possible to produce spray coatings, which are virtually free of oxides. Laboratory investigations show that cold spray coating have extremely high bond strengths and are exceptionally dense. In cold spray processes the powder requires a temperature of only a few hundred degrees. Coated substrates reveal no material changes due to thermal influence. 

In order to achieve high kinetic energy a high velocity gas jet needs to be created, which is achieved through a combination of pressure, gas heating and nozzle design. Linde’s booster technology is pressurizing nitrogen up to 4000psi (275 bar) in the liquid state. Afterwards the liquid nitrogen is evaporated in a high pressure ambient vaporizer.