Symmetrical layered gradient composite material and preparation method and application thereof

A composite material and gradient technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problem that the ceramic/metal phase interface cannot achieve long-term sealing, etc., and achieve improved material sealing and stability, high mechanical strength , the effect of relieving thermal stress

Pending Publication Date: 2020-12-08
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Si based on conventional techniques 3 N 4 There will be obvious ceramic / metal phase interface in the metallization of the ceramic surface, which cannot realize the long-term sealing of the energy storage technology in the harsh service environment, and it is urgent to carry out the research on the new nitride ceramic surface metallization technology

Method used

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  • Symmetrical layered gradient composite material and preparation method and application thereof
  • Symmetrical layered gradient composite material and preparation method and application thereof
  • Symmetrical layered gradient composite material and preparation method and application thereof

Examples

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preparation example Construction

[0035] A preparation method for preparing the symmetrical layered gradient composite material, the method includes the following steps:

[0036] Step 1, mixing: mix Mo powder, Si 3 N 4 Powder and sintering aids are fully mixed to obtain the required mixture for each layer;

[0037] Step 2, mold loading: stack the mixture required for each layer into the graphite mold in sequence according to the structural design in step 1 and press it into shape, then install the upper and lower graphite indenters sprayed with boron nitride release agent and embed them on the outer surface of the mould. Set of graphite carbon felt;

[0038] Step 3, sintering: place the graphite mold with the sample to be sintered in the spark plasma sintering furnace, complete pre-pressing and vacuuming, then axially pressurize and pass in a DC pulse current to rapidly heat up to the sintering temperature;

[0039]Step 4, mold removal: when the temperature of the sintering system drops to room temperature,...

Embodiment 1

[0052] Weigh an appropriate amount of Si 3 N 4 The powder was milled by a ball mill for 4 hours and then dried in a vacuum oven at 80°C for 12 hours; according to Si 3 N 4 Powder and Mo powder mass percentages are 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2, 9:1, respectively weigh raw materials, After ball milling with a ball mill for 2 hours, put it into a vacuum drying oven at 80° C. for 12 hours.

[0053] The ball milling process is as follows: put the raw material powder into a 125ml nylon ball milling tank, according to powder: alcohol: ZrO 2 The ratio of balls=1:1:4 is used for ball milling. The model of the ball mill used is Retsch PM100, and the speed of the ball mill is set at 300 rpm to obtain a mixed powder with a particle size of 0.5-2 μm.

[0054] Mix the powder according to the figure 1 The schematic diagram of the structure shown in c is laid layer by layer into a graphite mold with an inner diameter of 25mm. The amount of the middle ceramic layer is 2g, the am...

Embodiment 2

[0057] Weigh an appropriate amount of Si 3 N 4 The powder was milled by a ball mill for 4 hours and then dried in a vacuum oven at 80°C for 12 hours; according to Si 3 N 4 Powder and Mo powder mass percentages are 1:9, 3:7, 5:5, 7:3, 9:1, respectively weigh the raw materials, use a ball mill for 2 hours, and then put them in a vacuum oven at 80°C for 12 hours. .

[0058] The ball milling process is as follows: put the raw material powder into a 125ml nylon ball milling tank, according to powder: alcohol: ZrO 2 The ratio of balls=1:1:4 is used for ball milling. The model of the ball mill used is Retsch PM100, and the speed of the ball mill is set at 300 rpm to obtain a mixed powder with a particle size of 0.5-2 μm.

[0059] Mix the powder according to the figure 1 The schematic diagram of the structure shown in b is laid layer by layer into a graphite mold with an inner diameter of 25mm. The amount of the middle ceramic layer is 2g, the amount of each gradient layer is 1g,...

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Abstract

The invention relates to a symmetrical layered gradient composite material as well as a preparation method and application thereof, the method adopts a plasma activated sintering process to prepare amolybdenum / silicon nitride / molybdenum symmetrical layered gradient composite material, and the activation effect on powder particles before sintering is realized through the coupling effect of a temperature field, an electric field and a pressure field. Furthermore, the preparation of the gradient composite material is completed at a relatively low sintering temperature within a relatively short sintering time, and the molybdenum / silicon nitride / molybdenum symmetric layered gradient composite material with high density, low impurity content and good interface bonding is finally and quickly prepared by combining a plasma activated sintering method and the gradient of the gradient composite material.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic matrix composite materials, and in particular relates to a symmetrical layered gradient composite material and its preparation method and application. Background technique [0002] At this stage, Si 3 N 4 It is an important part of today's new engineering structure materials. It has the characteristics of oxidation resistance, high temperature resistance, and corrosion resistance. However, this ceramic material is hard and brittle, and it is difficult to machine, so it is difficult to manufacture complex shape components, such as Si 3 N 4 Such a special material with high hardness and high temperature resistance can only be connected with other materials (especially metal materials) to produce components that can meet engineering needs. For decades, people have studied a variety of connection methods, commonly used include: active metal method, hot pressure diffusion connection m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/645C04B37/02H01M2/08
CPCC04B35/584C04B35/622C04B35/645C04B37/021C04B2235/602C04B2235/6562C04B2235/6567C04B2235/666
Inventor 陈斐古星徐丽贾明勇吴玥奇沈强李慧薛晴
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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