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Method for preparing TiB2-M metal ceramic powder by microwave sintering

A microwave sintering and cermet technology, which is applied in metal processing equipment, metal material coating technology, coating, etc., can solve the problems of reducing friction coefficient and unstable powder structure performance, so as to improve wear resistance and shorten heat preservation time , the effect of low sintering temperature

Pending Publication Date: 2018-10-12
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention can overcome the problem of unstable powder structure and performance caused by traditional sintering heating, realize the stability of the structure, and refine the crystal grains; at the same time, it is sprayed on the surface of marine equipment in the form of a coating to reduce the friction coefficient between equipment, which can achieve improved The wear resistance of marine equipment materials, the purpose of prolonging the service life of marine equipment

Method used

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  • Method for preparing TiB2-M metal ceramic powder by microwave sintering
  • Method for preparing TiB2-M metal ceramic powder by microwave sintering
  • Method for preparing TiB2-M metal ceramic powder by microwave sintering

Examples

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Effect test

Embodiment 1

[0038] Preparation of TiB by Microwave Sintering 2 -M method of cermet powder, TiB 2 The particle size of Fe, Ni, Co is 1-3μm, and they are all purchased. In the present invention, TiB 2 , Fe or Ni or Co, rare earth oxides for ball milling and mixing, TiB 2 The ratio of M and M is 40%~60%:60%~40% by mass, and the addition amount of rare earth is 1%-1.5% of the total mass of the powder, and the dispersant ammonium polyacrylate is 0.8%-1.2% of the total mass of the powder. The binding agent polyethylene glycol is 10%-15% of the total mass of the powder. Through optimization of these parameters, the prepared cermet powder has good fluidity and high loose packing density. The particle size of the cermet powder is extremely fine and it is extremely prone to agglomeration. 2 The particle density of phase M is quite different, so add an appropriate proportion of anionic dispersant to the precursor solution, which can dissociate anionic radicals when dissolved in water, and adsorption ...

Embodiment 2

[0054] This embodiment is achieved by manufacturing TiB2 and Co composite cermet powders by high-speed centrifugal spray dryer preparation and microwave sintering equipment. Therefore, the specific steps in this embodiment are:

[0055] (1) Take 400g of commercially available TiB2 powder with a purity of 99.9%, 400g with a purity of 99.9% Co powder, with a mass ratio of 6:4 and a particle size of 3μm. Take 15g of lanthanum oxide, and add the three powders to a ball mill tank and mix them evenly; Add 1200g of absolute ethanol to the ball milling tank before the ball milling;

[0056] (2) Ball mill the three powders for 10 hours, then dry them at 70°C to obtain a uniformly mixed powder;

[0057] (3) Put the uniformly mixed powder into the ball mill tank, add 600g of deionized water and 12g of dispersant ammonium polyacrylate into the polyurethane ball mill tank for 3 hours;

[0058] (4) Add 75g of binder polyethylene glycol and continue ball milling for 4 hours;

[0059] (5) Continue to ...

Embodiment 3

[0066] This embodiment is realized by manufacturing TiB2 and Fe composite cermet powders by high-speed centrifugal spray dryer preparation and microwave sintering equipment. Therefore, the specific steps in this embodiment are:

[0067] (1) Take 500g of commercially available TiB2 powder with a purity of 99.9%, 500g with a purity of 99.9% Fe powder, with a mass ratio of 5:5 and a particle size of 2μm. Take 12.5g of lanthanum oxide and add the three powders to the ball milling tank and mix them evenly ; Add 1100g of absolute ethanol to the ball milling tank before the ball mill;

[0068] (2) Ball mill the three powders for 9 hours, and then dry them at 65°C to obtain a uniformly mixed powder;

[0069] (3) Put the uniformly mixed powder into the ball mill tank, add 500g of deionized water and 10g of dispersant ammonium polyacrylate into the polyurethane ball mill tank for 2.5 hours;

[0070] (4) Add 75g of binder polyethylene glycol and continue ball milling for 3.5 hours;

[0071] (5) C...

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Abstract

The invention discloses a method for preparing TiB2-M metal ceramic powder by microwave sintering, and belongs to the field of metal ceramic materials. The ball milling mixing is performed on TiB2, Fe, Ni, Co and rare earth oxides; a dispersing agent, a binding agent and water are added to prepare pulp; the ball milling is performed continuously; powder is dried by using a high-speed centrifugal spraying dryer; and the microwave sintering is performed to obtain metal ceramic composite powder. The mass ratio of TiB2 to Fe, Ni and Co is 40-60%: 60-40%; the adding quantity of rare earth is 1-1.5%of the total mass of the powder; the adding quantity of the dispersing agent-ammonium polyacrylate is 0.8-1.2% of the total mass of the powder; and the adding quantity of the binding agent-polyethylene glycol is 5-10% of the total mass of the powder. The method overcomes instability of the structure performance of traditional sintered and heated powder, and refines crystals; and meanwhile, the powder is sprayed on the surface of equipment in a coating form, so that the wear resistance of equipment materials can be improved, and the service life is prolonged.

Description

Technical field [0001] The invention belongs to the field of cermet materials, and more specifically, relates to a microwave sintering preparation of TiB 2 -M method of cermet powder. Background technique [0002] The development of marine engineering equipment materials requires marine special materials as support, and friction and wear in seawater environments is one of the biggest challenges for marine special materials. Seawater pumps have problems such as large leakage of friction pairs and increased friction and wear. There are problems of wear and deformation of friction pairs and corrosion problems of seawater, that is, "corrosion wear" of "mechanics-electrochemistry" interaction occurs. The extreme service conditions in the deep sea put forward higher requirements for the performance of materials, requiring materials with moderate hardness, high toughness, good work hardening performance, high tensile strength and fatigue limit, and excellent corrosion and wear resistanc...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00C23C4/06
CPCC23C4/06B22F9/04B22F2998/10B22F2009/043B22F1/142B22F1/10B22F9/026
Inventor 孙冬柏俞宏英李正一
Owner UNIV OF SCI & TECH BEIJING
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