Method for preparing vanadium nitride coating by using low-temperature flowing layer and device thereof
A vanadium nitride coating, low-temperature flow technology, applied in coating, metal material coating process, gaseous chemical plating, etc., can solve the problems of large deformation, poor coating density, and unsuitable surface strengthening treatment.
Active Publication Date: 2012-08-29
常州东传链传动科技股份有限公司
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However, the TD process and CVD method are both processed at a high temperature of about 1000 ° C, and the deformation is relatively large, so it is not suitable for surface strengthening treatment of high-precision molds such as fine stamping dies, injection molds, and die-casting molds.
Although the PVD method is processed at a low temperature of 400-600°C, which reduces the influence of high temperature on mold deformation, it has defects such as high processing cost, poor coating density and unevenness.
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[0019] (1) Mix alumina powder (80 mesh) and vanadium iron powder (120 mesh) in a ratio of 5:1 figure 1 In the reactor 3, nitrogen gas is fed into the air inlet port 10 to form a fluidized bed 11, and the flow rate of the nitrogen gas is 1.7m / s; the electric heating wire 10 heats the fluidized bed 10 to 580°C, and puts it into a complex high-precision Mold (comprising fine stamping die, injection mold and die-casting mold etc.) 9, activator supplier 2 provides the ammonium chloride that accounts for powder gross weight 5% as activator, makes mold 9 and fluidized bed 11 react 8 hours, generates nitrogen vanadium coating, such as figure 2 shown.
[0020] (2) figure 2 The metallographic structure of the vanadium nitride coating surface is good, and the coating surface uniformity is good, and its thickness increases with the increase of temperature, which is proportional to the treatment time. The hardness of vanadium nitride is 1500HV, which has excellent wear resistance.
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Abstract
The invention discloses a method for preparing a vanadium nitride coating by using a low-temperature flowing layer and a device thereof, belonging to the field of advanced material preparation. The method comprises the following steps of: suspending powder in a reactor due to ammonia gas fed from a gas inlet; moving and stirring the powder on a division plate by means of airflow to form a flowing layer; forming the reactor by welding steel plates; producing a cylindrical hearth by using silicon carbide; taking ammonium chloride provided by an activating agent supplier as an activating agent; filling a die in the powder in a flowing state; driving a clamp by a motor to do rotating movement; treating waste gas according to the temperature and time set by a temperature controller; and exhausting the processed waste gas from an exhaust port after passing through a filter. By adopting a method for stirring reactive gas, the formed vanadium nitride coating has favorable uniformity and can be used for low-temperature strengthened treatment on the surface of a high-precision die with complicated shapes.
Description
technical field [0001] The invention relates to a method for preparing a high-hardness vanadium nitride coating on the surface of a high-precision mold steel, which is a process method and a device for preparing vanadium nitride on the surface of a high-precision mold by using the heat radiation effect of a low-temperature fluidized layer, and belongs to the field of advanced material preparation. Background technique [0002] As a surface modification technology, diffusion treatment or diffusion infiltration treatment technology such as carburizing and nitriding has been widely used in surface treatment of mechanical parts, molds and tools. As a higher-performance surface diffusion treatment, the TD process (the reaction raw material is a powder molten salt bath) invented in the late 1960s, together with the CVD method (the reaction raw material is all gaseous) and the PVD method (the reaction raw material is metal atom evaporation), greatly improved Improved performance an...
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IPC IPC(8): C23C16/452C23C16/34
Inventor 孔德军周朝政严越峰胡爱萍李健朱伟
Owner 常州东传链传动科技股份有限公司