Method for preparing NiAl system intermetallic compound composite self-lubricating coating through self-propagating method

An intermetallic compound, self-lubricating coating technology, applied in the field of surfacing, can solve the problems of high cost, short wear-resistant time of self-lubricating coating, limited service temperature, etc.

Active Publication Date: 2016-02-03
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of short wear-resisting time, complex process, high cost and limited service temperature of the self-lubricating coating prepared by the existing method, and to provide a self-propagating method to prepare the NiAl-based intermetallic compound self-lubricating coating layer method

Method used

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  • Method for preparing NiAl system intermetallic compound composite self-lubricating coating through self-propagating method
  • Method for preparing NiAl system intermetallic compound composite self-lubricating coating through self-propagating method
  • Method for preparing NiAl system intermetallic compound composite self-lubricating coating through self-propagating method

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specific Embodiment approach 1

[0015] Embodiment 1: A method for preparing a NiAl-based intermetallic compound self-lubricating coating by a self-propagating method in this embodiment is carried out in the following steps:

[0016] 1. Mix the Ni powder and the Al powder evenly, and then hold the pressure for 15min to 30min under the condition of 180MPa to 360MPa to obtain a Ni-Al compact; the molar ratio of the Ni powder to the Al powder is (0.8 to 1.2 ):1;

[0017] 2. Mix Ni powder, Al powder and molybdenum disulfide by ball milling for 0.5h~1.5h, and then hold the pressure for 15min~30min under the condition of 180MPa~360MPa to obtain 3Ni-Al-MoS 2 Compact; the mol ratio of the Al powder described in step 2 and the Al powder described in step 1 is 1:1; The mol ratio of the Ni powder described in step 2 and the Al powder described in step 2 is ( 2.8~3.2): 1; the mass ratio of the total mass of Ni powder and Al powder described in step 2 to molybdenum disulfide is 100: (5~20);

[0018] 3. Stack the lower h...

specific Embodiment approach 2

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the molar ratio of Ni powder and Al powder in step 1 is 1:1. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that in step 1, the Ni-Al compact is obtained by holding the pressure for 20 minutes to 25 minutes under the condition of 270 MPa. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention belongs to the technical field of overlaying, and particularly relates to a method for preparing an NiAl system intermetallic compound composite self-lubricating coating through a self-propagating method. The method aims to solve the problems that a self-lubricating coating prepared through an existing method is short in wear resisting time, complex in process, high in cost and limited in use temperature. The method comprises the steps that firstly, an Ni-Al pressing blank is pressed according to the molar ratio of 1:1; secondly, a 3Ni-Al-MoS2 pressing blank is pressed according to the molar ratio of 3:1; and thirdly, the 3Ni-Al-MoS2 pressing blank, the Ni-Al pressing blank and a metal base body are stacked from top to bottom, then the Ni-Al pressing blank is ignited, pressurization is carried out while igniting is carried out, pressure relief is carried out after combustion is finished, and the NiAl system intermetallic compound composite self-lubricating coating is obtained. The coating prepared through the method has the remarkable lubricating effect; the process for preparing the coating is quick and high in efficiency; and energy is saved, and environment friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of surfacing welding, and in particular relates to a method for preparing a NiAl-based intermetallic compound composite self-lubricating coating. Background technique [0002] Self-propagating high-temperature synthesis (SHS) is a fast, simple, and economical NiAl coating preparation and bonding technology, so it has attracted widespread attention from domestic and foreign scholars. Use a heat source to ignite from one end of the reaction system. When the end point temperature reaches the ignition temperature, the reaction system begins to react and release enough heat to make the adjacent unreacted area also reach the ignition temperature. Finally, the combustion spreads to the entire reaction system, and the combustion synthesis is obtained the final product. The self-propagating high-temperature synthesis method is mainly used for the synthesis of materials, the connection of dissimilar materials, and th...

Claims

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Application Information

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IPC IPC(8): B22F7/02B22F3/23
Inventor 王浪平李磊
Owner HARBIN INST OF TECH
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