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Method and device for preparing spherical titanium nitride powder

A titanium nitride and spherical technology, which is applied in the field of plasma powder production equipment to prepare spherical titanium nitride powder, can solve the problems of large energy loss and poor sphericity of titanium nitride, and achieve short reaction time, spheroidization rate and Increased nitriding rate and low raw material requirements

Pending Publication Date: 2018-06-29
PANZHIHUA UNIV
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Problems solved by technology

[0005] Patent 200410072553.4 discloses a method for reactive plasma spraying nanocrystalline titanium nitride powder, using a plasma spray gun for spraying, specifically including the main steps: titanium powder into the powder feeder, into the mixed ion gas, into the reaction chamber Through nitrogen, titanium powder is sent into the flame flow, sprayed and collected in a container containing water. Using this method, titanium nitride powder particles with a diameter of 30-100 nm can be obtained. However, this method uses a plasma spray gun to prepare nitrided particles. Titanium powder, sending titanium powder into the flame flow, spraying and collecting in the container of water, the energy loss is large
And the sphericity of the obtained titanium nitride is not good, and the spheroidization rate needs to be further improved

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  • Method and device for preparing spherical titanium nitride powder

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preparation example Construction

[0028] The preparation method of spherical titanium nitride of the present invention is prepared by radio frequency plasma equipment, and specifically comprises the following steps:

[0029] a. Arcing: Argon is used as the ionized gas to start the arc, and nitrogen is introduced from the protective gas inlet of the radio frequency plasma equipment at the same time; the operating voltage of the radio frequency plasma equipment is controlled to be 5-15kV, and the power is 30-200kW; among them, The flow rate of ionized gas is 1~10m3 / h, and the flow rate of nitrogen gas at the inlet of protective gas is 1~10m3 / h;

[0030] b. Feeding: After the arc is stable, the titanium powder is fed into the titanium powder by the feeding device, and the titanium powder is spheroidized in the plasma torch while being directly nitrided to obtain semi-molten titanium nitride; then the semi-molten titanium nitride is in the Under the action of surface tension, it cools and solidifies into a spheric...

Embodiment 1

[0045] use figure 1 The radio frequency plasma powder production equipment shown produces spherical titanium nitride powder. The amplitude of the feeding device of the radio frequency plasma powder production equipment is set at 20%, the operating voltage is 10.5KV, and the power is 32kW. The "edge gas" (that is, the inlet of the protective gas) is fed with nitrogen, and the "intermediate gas" (that is, the inlet of the ionized gas) is fed with argon gas, and the flow rate of nitrogen gas is 3m 3 / h, argon gas flow rate is 3m 3 / h, where nitrogen is the reaction gas and argon is the ionizing gas. The feeding reaction was carried out for 5 minutes, and the materials were collected to prepare spherical titanium nitride powder. Its SEM picture is as follows image 3 As shown, its XRD pattern is shown in Figure 4 , Figure 4 The upper curve is the final product TiN prepared in Example 1, and the lower curve is TiN powder containing Ti. The spheroidization rate of this meth...

Embodiment 2

[0048] use figure 1 The radio frequency plasma powder production equipment shown produces spherical titanium nitride powder. The amplitude of the feeding device of the radio frequency plasma powder production equipment is set at 22%, the operating voltage is 11.5kV, and the power is 54kW. "Side gas" (that is, the protective gas inlet) is fed with nitrogen gas, and "middle gas" (that is, the ionized gas inlet) is first passed with argon gas to start the arc. After the arc is stable, close the argon gas and feed nitrogen gas, and adjust the "middle gas" flow rate to 3m 3 / h, the flow rate of "edge air" is 3m 3 / h, feeding reaction 5min receiving, the measured titanium nitride powder quality is 27g. Its SEM image and image 3 Similarly, its XRD pattern is similar to Figure 4 The above curve is similar. This method achieves a spheroidization rate of 92% and a nitriding rate of 86%.

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Abstract

The invention relates to a method and a device for preparing spherical titanium nitride powder, in particular to the method and the device for preparing the spherical titanium nitride powder by a radio frequency plasma powder production technology. The invention aims to provide a method for preparing the spherical titanium nitride powder with simple preparation process and high spheroidization rate. The method uses titanium powder as raw material and nitrogen as reaction gas to prepare the titanium nitride powder in one step, the process flow is short, the reaction time is short, the production efficiency is greatly improved, an obtained product has no impurity pollution, a preparation process is simple, raw material requirements are low, and the method lays a foundation for the industrialproduction of the spherical titanium nitride powder. The spherical titanium nitride powder prepared by the method has high spheroidization rate and nitriding rate. The preparation of the raw materialdoes not require a large amount of crushing, and the product has a small particle size.

Description

technical field [0001] The invention relates to a method and equipment for preparing spherical titanium nitride powder, in particular to a method for preparing spherical titanium nitride powder by using radio frequency plasma powder production equipment. Background technique [0002] The metal compound TiN has many excellent physical and chemical properties. It has excellent corrosion resistance, wear resistance and oxidation resistance. It has a high melting point (3205°C) and a hardness of 1990 (×9.8N / mm 2 ). TiN deposition on jewelry and lamps can not only achieve aesthetic effect, but also enhance wear resistance. It is a potential material to replace WC, which is widely used at present, and can greatly reduce the cost of material application. TiN compounds have high biocompatibility, and also have high application value in clinical medicine and stomatology. In addition, TiN can also be used to make crucibles, cutting tools, additives, etc. The breadth and depth of ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/076
CPCC01B21/0761C01P2002/72C01P2004/32C01P2004/03C01P2004/61C01P2004/60
Inventor 赖奇廖先杰张树立
Owner PANZHIHUA UNIV
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