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Micro-nano intragranular multiphase granule and thermal explosion reaction synthetic method thereof

A thermal explosion reaction, micro-nano technology, applied in the field of micro-nano composite materials and their synthesis, micro-nano intracrystalline multi-phase particles and their thermal explosion reaction synthesis method, can solve the problems of poor toughness, high brittleness, etc., and achieve improved performance , Improve toughness and high bonding strength

Inactive Publication Date: 2014-06-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple to operate, safe and reliable, energy-saving and time-saving, and environmentally friendly, and the micro-nano particles are all generated by in-situ reactions, with no pollution on the surface and clean interfaces. Significantly improve the toughness and strength of the micron phase, thereby providing new reinforcements for metal matrix composites, and providing solutions for the poor toughness and high brittleness of ceramic matrix composites

Method used

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  • Micro-nano intragranular multiphase granule and thermal explosion reaction synthetic method thereof
  • Micro-nano intragranular multiphase granule and thermal explosion reaction synthetic method thereof
  • Micro-nano intragranular multiphase granule and thermal explosion reaction synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Al-TiO 2 -B 2 o 3 reaction system

[0032] (1) Preparation of reaction samples Al powder, TiO 2 Powder and B 2 o 3 The molar ratio of the powder is 10:1:1, and then they are put into a ball mill tank, mixed with a ball-to-powder ratio of 5:1, and a speed of 300p.r.m, and then extruded into a billet with a pressure of 120MPa to make a compact. Sample;

[0033] (2) Loading and vacuuming the compacted sample into the vacuum reaction furnace, and vacuuming to 10 －4 -10 －3 Pa;

[0034] (3) Reaction synthesis Adjust the input power, the heating rate is 20K / min and the temperature rises to 900°C for the compacted sample to undergo a chemical reaction;

[0035] (4) Heat preservation Once the chemical reaction of the reaction sample occurs, the input power can be lowered, and the power input can be stopped after 30 minutes of heat preservation.

[0036] (5) Cool down and take out the furnace. When the furnace is cooled to room temperature, the furnace is o...

Embodiment 2

[0042] Example 2: Al-TiO 2 -B 2 o 3 reaction system

[0043] (1) Preparation of reaction samples Al powder, TiO 2 Powder and B 2 o 3 The molar ratio of the powder is 12:1:1, and then they are put into a ball mill tank, ball milled and mixed at a ball powder ratio of 4.5:1 at a speed of 280p.r.m, and then extruded into a billet with a pressure of 120MPa to make a compact. Sample;

[0044] (2) Loading and vacuuming the compacted sample into the vacuum reaction furnace, and vacuuming to 10 －4 -10 －3 Pa;

[0045] (3) Reaction synthesis Adjust the input power, raise the temperature at a heating rate of 18K / min, and the chemical reaction will occur in the compacted sample at 880°C;

[0046] (4) Heat preservation Once the chemical reaction of the reaction sample occurs, the input power can be lowered, and the power input can be stopped after 50 minutes of heat preservation.

[0047] (5) Cool down and take out the furnace. When the furnace is cooled to room temperature, th...

Embodiment 3

[0052] Example 3: Al-TiO 2 -B 2 o 3 reaction system

[0053] (1) Preparation of reaction samples Al powder, TiO 2 Powder and B 2 o 3 The molar ratio of the powder is 17:1:1, and then they are put into a ball mill tank, mixed with a ball powder ratio of 5:1, 300p.r.m speed of ball milling, and then extruded into a billet with a pressure of 120MPa to make a green compact. Sample;

[0054] (2) Loading and vacuuming the compacted sample into the vacuum reaction furnace, and vacuuming to 10 －4 -10 －3 Pa;

[0055] (3) Reaction synthesis Adjust the input power, heat up at a heating rate of 15K / min, and the compacted sample undergoes a chemical reaction at 860°C;

[0056] (4) Heat preservation Once the chemical reaction of the reaction sample occurs, the input power can be lowered, and the power input can be stopped after 60 minutes of heat preservation.

[0057] (5) Cool down and take out the furnace. When the furnace is cooled to room temperature, the furnace is opened f...

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Abstract

The invention discloses a micro-nano intragranular multiphase granule and a thermal explosion reaction synthetic method thereof. According to the multiphase granule, micron-level alpha-Al2O3 and nanometer-level TiB2 are taken as the multiphase, and alpha-Al2O3 is grown and formed by taking nanometer-level TiB2 as a nucleus. The multiphase granule is prepared according to the following steps: mixing Al powder, TiO2 powder and B2O3 powder, and performing ball milling, wherein the molar ratio of Al, TiO2 and B2O3 is (10-17):1:1; extruding the powder subjected to ball milling into a blank sample; placing the sample in a vacuum furnace and vacuumizing; controlling the temperature raising speed at 15-20 K / min, heating to the moment that the sample is subjected to the thermal explosion reaction; after the reaction is finished, keeping the temperature for 30-60 min, shutting down the furnace to obtain intragranular multiphase granule blocks; and dissolving residual aluminium with an alkali aqueous solution, washing and filtering to obtain a wet powder, and drying to obtain the intragranular granule powder. Micro-nano granules forming the intragranular multiphase granules are all generated through the thermal explosion reaction, and the surface are clean and free of pollution; and under the exothermic effect of the reaction, the micro-nano intragranular multiphase granules are grown and formed through intracrystallization, the interfaces of the micro-nano granules are clean, the bonding strength is high, and the toughness of the intragranular multiphase granules is substantially improved.

Description

technical field [0001] The invention relates to a micro-nano composite material and a synthesis method thereof, in particular to a micro-nano inner crystal composite phase particle and a thermal explosion reaction synthesis method thereof, belonging to the field of material preparation. Background technique [0002] The micro-nano internal crystal composite particle material refers to the micro-nano internal crystal composite particles produced by thermal explosion reaction and formed by internal crystallization growth. The surface of the internal crystal composite particles has no pollution, the interface of micro-nano particles is clean, the bonding strength is high, and the thermodynamics are stable. The high heat of the reaction can also purify the matrix, further improve the structure and improve the performance of the material. At present, there is no public report on the preparation method of the micro-nano internal crystal composite phase particle material, only a sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/117C04B35/622
Inventor 朱和国王皓杰王克鸿
Owner NANJING UNIV OF SCI & TECH
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