Material cow note: the wear of industrial tools has been a "old and difficult problem"

 problem. The traditional chromium plating process is slowly abolished because of the

 carcinogenicity of six valence chromium. PVD and thermal spraying also have its

 inherent limitations. The CVD coating can reduce the wear of forming tools, improve

 the life of the tool, keep the finish of the workpiece surface, and also reduce the

 surface of the workpiece. Less stop time, reduce waste rate.

brief introduction

Industrial applications often use more complex tools, such as extrusion, injection

 molding, and some other material forming technologies. Machining tools such as cos

t intensive machining and finish machining depend on hard materials such as 

cemented carbide and tool steel. For example, the extrusion die controls the outer

 tube shape of the product, and once the mold is corroded or worn, it can not 

continue processing. The resulting problems may affect productivity and increase 

additional downtime costs.

The use of a large hard material processing tool can reduce the problems of wear 

and tear, but it will be very challenging if the shape of the workpiece is unique and is 

not conducive to processing, and the cost will increase. The alternative is to use hard 

tools and apply hard coatings. For example, cemented carbide steel is easy to form 

and is coated on its surface to form a hard surface. The result of the combined effect

 is that the life of tools is increased and the risk of deterioration of surface quality is 

greatly reduced. This method improves productivity, reduces tool wear and tool

 replacement costs.
Process plan - new process VS traditional process
Hard chromium plating (HCP), physical vapor deposition (PVD) and thermal spraying 

are traditional methods used in industrial tools. Each method has its own limitations.

 A thick and stable coating can be used by thermal spraying, but its surface is rough

 and porous and needs to be lapping. It can not be used for a tool with complex

shape. The preparation of a coating with a thickness less than 4 m hard and thin 

can be used in the PVD method, but its bearing capacity is limited. The application

 of these coating methods is attributed to the stabilization of the sight line, but such

 a coating method is not suitable for complex design and internal surface plating.

 Although chromium plating can be worn and corroded to a certain extent, the EU

 will eliminate the process due to the carcinogenic effect of six valent chromium salts, 

which will be banned by 2017. At the same time, the occupational safety and Health

 Administration (OSHA) also imposed strict restrictions on it.
It
Chemical vapor deposition (CVD) is an atom of an atom that begins to crystallize from 

the gas phase, forming a conformal coating that can be distributed on the outer surface

 and in a complex shape. The chemical vapor deposition occurs at a temperature of

 about 500 C vacuum reaction chamber, and the microstructure of the coating is 

distributed evenly by the tungsten carbide nanoparticles of 1 - 10nm. Nanomaterials

 have unique crack, toughness and impact resistance characteristics. It


Advantages of nanostructured CVD coating
The CVD technology extends the application field of hard coatings, which can be

 evenly coated on the parts with internal and external surfaces and complex shapes. 

This performance is essential for the tools to handle abrasive materials, such as plastic,

 metal injection, extrusion wood plastic composite, powder molding and ball making.

 In addition, the CVD coating can reduce the wear of the material forming tool, which

 can increase the life of the tool by three times, keep the finish of the workpiece

 surface, reduce the stop time and reduce the waste rate.