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Method for tungsten modification treatment of powder surface

A powder and modification technology, which is applied in the direction of gaseous chemical plating, coating, transportation and packaging, etc., can solve the problems of uniformity of mixing, uneven particle distribution and complicated process in the scale-up production process, and achieve the goal of overcoming fine The powder is difficult to fluidize, the reaction efficiency is high, and the coating integrity is high

Inactive Publication Date: 2019-02-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical mixing method is simple in operation and low in cost, it is easy to introduce impurities, reduce the purity, and the particle distribution is uneven; the process of electroless plating and electroplating is complicated, and the ceramic particles need to undergo complicated pretreatments such as roughening, activation, and sensitization. The process is expensive; and it is easy to introduce impurity salts, amplify the change of stirring uniformity in the production process, resulting in uneven coating and even a large amount of self-nucleating metals, and a large amount of toxic and harmful waste liquid generated during the reaction process, which is easy to cause environmental pollution

Method used

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  • Method for tungsten modification treatment of powder surface
  • Method for tungsten modification treatment of powder surface
  • Method for tungsten modification treatment of powder surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Aluminum powder with a particle size of 50 μm is placed in a fluidized bed reactor. The fluidized bed reactor is in a heating furnace. The reaction temperature of the heating furnace is 450 ° C. The fluidizing gas is a mixed gas of argon and hydrogen, and the volume percentage of hydrogen is is 20%, and the gas velocity is 0.08m / s. Load tungsten hexachloride vapor into the fluidized bed, and react with the powder fluidized section in the fluidized bed. The reaction time is 90min, and tungsten-coated aluminum is obtained. Composite powder, the tail gas enters the treatment system through the pipeline. The mass percent of tungsten coating is 8%.

Embodiment 2

[0026] Put titanium powder with a particle size of 60 μm in a fluidized bed reactor, the fluidized bed reactor is in a heating furnace, the reaction temperature of the heating furnace is 520 ° C, the fluidizing gas is a mixed gas of argon and hydrogen, and the volume percentage of hydrogen is is 20%, and the gas velocity is 0.14m / s. Load tungsten hexafluoride vapor into the fluidized bed, and react with the powder fluidized section in the fluidized bed. The reaction time is 60min, and tungsten-coated titanium is obtained. Composite powder, the tail gas enters the treatment system through the pipeline. The mass percent of tungsten coating is 6%.

Embodiment 3

[0028] Put titanium carbide powder with a particle size of 220 μm in a fluidized bed reactor, the fluidized bed reactor is in a heating furnace, the reaction temperature of the heating furnace is 650 ° C, the fluidizing gas is a mixed gas of argon and hydrogen, and the hydrogen The volume percentage is 30%, and the gas velocity is 0.34m / s. The tungsten hexabromide vapor is loaded into the fluidized bed, and reacts with the powder fluidized section in the fluidized bed. The reaction time is 30min, and the tungsten cladding is obtained. Coated with titanium carbide composite powder, the exhaust gas enters the treatment system through the pipeline. The mass percent of tungsten coating is 5%.

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Abstract

The invention discloses a method for tungsten coating modification treatment of a powder surface. A chemical vapor deposition technology of a fluidized bed is adopted, and the method comprises the following step (1) of adding matrix powder to a fluidized bed reactor arranged in a heating furnace, and regulating the speed of fluidizing gas, so that the matrix powder is in the fluidized state; and the step (2) of introducing reactive gas into a matrix powder fluidizing section in the fluidized bed, reacting in the fluidized bed, and depositing metal tungsten on the surface of the matrix powder,so that tungsten coating composite powder is formed. The method for tungsten modification treatment of the powder surface is simple in technological process and low in production cost, and continuousoperation and expanded production are easy to achieve. The synthetic tungsten coating powder is of a core-shell structure, and the combining capacity between the metal tungsten and the interface of the matrix powder is high.

Description

technical field [0001] The invention relates to the technical field of surface treatment of powder particles, in particular to a method for modifying the surface of powder with tungsten. Background technique [0002] Tungsten is the metal with the highest melting point in nature (3410°C), and has the advantages of high temperature resistance, high hardness, chemical stability, etc. It is often used as a reinforcing phase or a modified phase to prepare composite powders to achieve powder modification sexual purpose. According to different substrate materials, it can be divided into metal base, ceramic base and diamond powder, such as tungsten-copper powder, tungsten-titanium powder, tungsten-titanium carbide powder and tungsten-modified diamond powder. In these composite powders, the interfacial bonding force between the metal tungsten component and the matrix powder and the uniformity of tungsten distribution are considered to be the key factors affecting the comprehensive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C16/14C23C16/442
CPCC23C16/14C23C16/442B22F1/17
Inventor 熊智慧吕鹏鹏杨亚锋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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