System and preparation method of a high-temperature wear-resistant composite material

A composite material, high temperature wear resistance technology, applied in the field of new system metal ceramic composite material and its preparation, can solve the problem that the reaction speed of aluminum powder reduction iron oxide is difficult to control, the shape of high temperature wear resistance lining is difficult to control, and the physical compatibility is affected. and chemical compatibility and other issues, to achieve the effect of eliminating the need for reinforcement pretreatment process, good compatibility, and uniform distribution of physical and metal phases

Active Publication Date: 2017-03-01
INNER MONGOLIA UNIV OF SCI & TECH
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Problems solved by technology

But Al 2 o 3 Poor toughness, in order to improve its disadvantages, ductile metal particles are often added
Common Fe cannot be used directly as Al due to poor wettability 2 o 3 toughened metal
Document 1 (Wang Zhi, Liu Jianfei, Ding Yinsen, etc. Fe / Al 2 o 3 Preparation and properties of composite materials [J]. Materials Research Journal, 2012,26(2): 206-210) reported a Fe and Al 2 o 3 The composite method of ceramics, the disadvantage of this method is that metal Al needs to be added to improve Fe and Al 2 o 3 The wettability of ceramics, but the metal powder and Al 2 o 3 Ceramic powder is not easy to mix completely and evenly, which affects the physical compatibility and chemical compatibility of each phase
Patent CN02245580.9 reports a preparation method of high-temperature wear-resistant pipe fittings, which adopts welding tortoise shell nets on the steel shell, and then disperses corundum, sintered bauxite or quartz as aggregates in composite phosphate polymers and coagulants to solidify The high temperature and wear-resistant lining formed in the object, the disadvantage of this method is that the tortoise shell mesh needs to be welded first, the shape of the high temperature and wear-resistant lining formed is difficult to control, the forming precision is low, and the fracture toughness is poor
Document 2 (Zang Guopeng. Reactive plasma spraying Fe-Al 2 o 3 -FeAl 2 o 4 Research on the formation mechanism of composite coating [D]. Tianjin: Hebei University of Technology, 2011) introduced a reactive plasma spraying Fe-Al 2 o 3 -FeAl 2 o 4 Composite coating method, which uses industrial aluminum powder and iron oxide powder as raw materials, prepares composite powder suitable for plasma spraying by spray granulation method, and prepares composite powder into cermet composite powder by plasma spraying technology Coating, the disadvantage of this patent is that the reaction speed of aluminum powder reduction iron oxide is not easy to control, the coating is thin and the wear resistance is poor
So far, there is no report on the synthesis of Fe-FeAl by in situ reaction in the world 2 o 4 metal-ceramic composite

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  • System and preparation method of a high-temperature wear-resistant composite material

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Experimental program
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Effect test

Embodiment 1

[0034] Take Fe with particle size less than 20 microns 3 o 4 Powder, Al 2 o 3 Powder and activated carbon powder, according to M Fe / M Al =0.9, M O / M C = 1.5 ratio ingredients. Add an appropriate amount of dispersant to the prepared powder and mix it in a ball mill for 24 hours. The ratio of balls to materials is 3:1. The speed of the ball mill is 100 rpm. The materials are mixed evenly. After curing, the molding pressure is 5MPa, the pressure holding time is 5 minutes, pressed into a φ25.5±0.5mm cylinder, and dried under low temperature vacuum. The pressed cylindrical sheet is sintered at 1300°C in an atmosphere of nitrogen and argon with a volume ratio of 1:1, the auxiliary pressure is 10MPa, the holding time is 5 minutes, and cooled to room temperature to obtain Fe-FeAl 2 o 4 Cermet. The obtained product is detected, and the mass percentages of the metal phase and the non-metal phase are 33% and 67% respectively.

[0035] The wetting angle of the phase is small,...

Embodiment 2

[0037] Take Fe with particle size less than 20 microns 2 o 3 、Al 2 o 3 Powder and coke powder, according to M Fe / M Al =1.2, M O / M C = 1.0 scale ingredients. Add an appropriate amount of dispersant to the prepared powder and mix it in a ball mill for 48 hours. The ratio of balls to materials is 10:1. The speed of the ball mill is 250 rpm. After curing, the forming pressure is 30MPa, the holding time is 1 minute, pressed into a φ25.5±0.5mm cylinder, and dried under vacuum at low temperature. Sintering at 1400°C under an argon atmosphere, the auxiliary pressure is 40MPa, and the sintering time is 25 minutes. Other preparation methods are the same as in Example 1 to obtain Fe-FeAl 2 o 4 Cermet. The obtained product is detected, and the mass percentages of the metal phase and the non-metal phase are 45% and 55% respectively.

[0038] The wetting angle of the phase is small, the interface is well bonded, the surface of the ceramic particles is pure, the compatibility be...

Embodiment 3

[0040] Take Fe with particle size less than 20 microns 3 o 4 , Fe 2 o 3 , Al(OH) 3 Powder and activated charcoal powder according to M Fe / M Al =1.1, M O / M C =1.2 Ratio ingredients, where Fe 3 o 4 / Fe 2 o 3 The molar ratio is 2:1. Add an appropriate amount of dispersant to the prepared powder and mix it in a ball mill for 36 hours. The ball-to-material ratio is 8:1, the ball mill speed is 200 rpm, and the material is mixed evenly. Take it out and dry it under low temperature vacuum, and add an appropriate amount of binder Finally, the forming pressure is 20MPa, the holding time is 3 minutes, pressed into a φ25.5±0.5mm cylinder, and dried under low temperature vacuum. Sintering at 1500°C under a nitrogen atmosphere, the auxiliary pressure is 20MPa, and the sintering time is 25 minutes. Other preparation methods are the same as in Example 1 to obtain Fe-FeAl 2 o 4 Cermet. The obtained product is detected, and the mass percentages of the metal phase and the non-me...

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Abstract

The invention relates to a novel high-temperature wear-resisting material adopting Fe-FeAl2O4 as a main phase. The weight percentage contents of a metal phase and a ceramic phase in the material are respectively 33 percent to 45 percent and 67 percent to 55 percent. The novel high-temperature wear-resisting material is high in hardness, high in flexibility, low in abrasion rate, capable of resisting the surface wear and erosion of solid particles in the fields such as metallurgy, materials, heat energy, and the like at the temperature of 1100 DEG C or below and is particularly suitable for protecting devices such as a high-temperature heat exchanger air duct, a cyclone separator lining, a dust-containing ventilation pipeline and the like. The invention also relates to a preparation method of the high-temperature wear-resisting composite material. The preparation method is characterized by adopting iron oxide powder, carbon powder and aluminum oxide powder as raw materials to prepare the novel high-temperature wear-resisting metal ceramic material by virtue of an in-situ synthesis method under high temperature. The process is simple, parameters are controllable, cost is low, the ratio of the metal phase to the ceramic phase is controllable, and the phase interface is clean and good in combination.

Description

technical field [0001] The invention belongs to the technical field of metal-ceramic composite materials and their preparation, and in particular relates to a new system of metal-ceramic composite materials and a preparation method thereof. Background technique [0002] Composite materials are composed of two or more materials with different properties, through physical or chemical methods, macroscopically composed materials with new properties. Various materials learn from each other in terms of performance and produce synergistic effects, so that the comprehensive performance of the composite material is better than that of the original constituent materials to meet various requirements. The matrix materials of composite materials are divided into two categories: metal and non-metal. [0003] The most widely used advanced ceramic material is Al2O3 ceramics known as the "King of Ceramics". The raw materials of alumina ceramics are widely distributed, the product performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/12C22C1/05
Inventor 张福顺赵增武李保卫
Owner INNER MONGOLIA UNIV OF SCI & TECH
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