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Ti-Fe-Ni-C series reaction thermal spraying composite powder and preparation technique thereof

A technology of composite powder and heat of reaction, applied in metal material coating process, coating, molten spraying, etc., can solve the problems of limitation, low coating wear resistance, unfavorable coating performance improvement, etc., and achieve porosity Low, not easy to separate, reduce the effect of TiC aggregates

Inactive Publication Date: 2009-07-08
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The current carbonization process can only prepare composite powders with a total content of Ti and C elements less than 53wt%, otherwise due to the high content of sucrose in the mixed powder, the oxidation exothermic reaction cannot be avoided during the carbonization process
The content of TiC reinforcing phase in the coating deposited by spraying the composite powder with low content of Ti and C is less than that of the ceramic phase volume ratio of about 90% of the commonly used WC / Co wear-resistant coating, and the wear resistance of the coating is not high
The original carbonization process greatly limits the system composition design of the reactive thermal spraying composite powder prepared with sucrose as the precursor, which is not conducive to the improvement of the performance of the coating prepared by using the powder

Method used

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  • Ti-Fe-Ni-C series reaction thermal spraying composite powder and preparation technique thereof
  • Ti-Fe-Ni-C series reaction thermal spraying composite powder and preparation technique thereof
  • Ti-Fe-Ni-C series reaction thermal spraying composite powder and preparation technique thereof

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Embodiment Construction

[0027] The raw material powder that the present invention adopts is TiFe powder, Ti powder, Ni powder, Fe powder and sucrose, and prepared Ti-Fe-Ni-C system reactive thermal spraying composite powder composition is as shown in Table 1, and its concrete technological process is as follows :

[0028] 1) Mix TiFe powder (2-10 μm), Ti powder (2-10 μm), Ni powder (2-5 μm), Fe powder (2-5 μm) and sucrose according to the ratio;

[0029] 2) The mixed raw material powder is wet milled on a ball mill for 24 to 72 hours, the volume ratio of the steel ball to the raw material mixture used is 4:1, the speed of the ball mill is 120rpm, and the ball milling medium is alcohol;

[0030] 3) Dry the uniformly mixed slurry after ball milling at 45-60°C for 4-12 hours;

[0031] 4) Put the block-shaped mixed powder after drying the slurry into a heat treatment furnace protected by nitrogen, and the thickness of the charge is 2-10cm;

[0032] 5) First pass nitrogen protection for 5-10 minutes, th...

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Abstract

The present invention is one kind of composite hot sprayed Ti-Fe-Ni-C powder capable of forming composite TiC / Fe-Ni alloy coating and its preparation process. The composite Ti-Fe-Ni-C powder containing Ni in the amount of 32-45 wt% of Fe+Ni content and Ti+C in over 70 wt% is prepared with sucrose as the precursor of C. The TiC / Fe-Ni alloy coating formed through hot spraying with Fe-Ni alloy as the adhering phase has the advantages of small stress, low porosity, high bonding strength between the Fe-Ni alloy and TiC, excellent high temperature antiwear and anticorrosion performance and small TiC grain size.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a Ti-Fe-Ni-C system reactive thermal spraying composite powder and a preparation process thereof, which are used for TiC / Fe-Ni alloy composite coating. Background technique [0002] Ceramic / metal composite coatings, especially carbide / metal composite coatings have excellent wear resistance and are widely used in civil and defense industries such as metallurgy, energy, petrochemicals, automobiles, and aerospace. Research and development of high-quality, high-efficiency, and low-cost ceramic / metal composite coating preparation technology has been one of the most active research topics in the field of wear-resistant materials and surface engineering in recent years. The properties of ceramic / metal composite coatings are mainly related to the reinforcing phase, bonding phase and coating preparation process. [0003] In terms of reinforcing phase, it is different from WC an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06B22F9/04B22F1/00C22C14/00C22C30/00C22C38/08C22C38/14
Inventor 黄继华王海涛徐俊龙朱警雷殷常峰张华程东海
Owner UNIV OF SCI & TECH BEIJING
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