Method for preparing micro-nano TiC/TiSi2 composite powder

A composite powder, micro-nano technology, applied in the direction of carbide, metal silicide, titanium carbide, etc., can solve the problems of complex equipment, high reaction temperature, low production efficiency, etc., to prevent oxidation and agglomeration, avoid agglomeration, The effect of increasing the specific surface area

Inactive Publication Date: 2014-08-13
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reaction temperature is high and the time is long, so the production efficiency is low, the e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The present invention prepares micronano TiC / TiSi 2 The method for composite powder, its preparation steps are:

[0025] (1) According to the final prepared TiC / TiSi 2 The ratio of the three elements in the composite powder is prepared for silicon powder, titanium powder and graphite powder, the molar ratio of silicon powder, titanium powder and graphite powder is 4: 3:1, and the particle size of silicon powder, titanium powder and graphite powder 350 mesh; mix silicon powder, titanium powder and graphite powder evenly, the purpose of this step is to mix the reactants evenly to facilitate the subsequent reaction;

[0026] (2) Add sodium chloride to the mixed powder obtained in step (1), and the amount of sodium chloride added is 1.5 times the weight of the mixed powder; this step adds sodium chloride on the basis of step (1) It is to control the dispersibility of the final product and prevent the product from agglomerating into large particles. At the same time, beca...

Embodiment 2

[0033] The raw materials are commercial silicon powder, titanium powder and graphite powder with a particle size of 300 mesh, and the molar ratio is 2:2:1. The ingredients are 30 grams in total, 30 grams of NaCl are added, and after mixing, they are put into a stainless steel ball mill tank of a ball mill, and the steel tank is ground with rubber After the ring is sealed, vacuumize to 0.5Pa, fill with argon, and the pressure is 0.9atm. Control the ball-to-material ratio to 10:1, and control the speed of the ball mill to 300 rpm. After ball milling for 6 hours, use a tablet machine to make a φ20mm green body under an axial pressure of 4MPa, and put the green body at 1000°C in molten NaCl for 60 minutes. After the reaction, the cooled TiC / TiSi 2 Put the salt block of composite powder into water 10 times the weight of the salt block, and soak for 10 hours. After NaCl is completely dissolved in water. Filter out TiC / TiSi 2 Composite powder, TiC / TiSi 2 After the composite powd...

Embodiment 3

[0035] The raw materials are commercial silica powder, titanium powder and graphite powder with a particle size of 320 mesh, and the molar ratio is 1:1.5:1. The ingredients are 30 grams in total, 60 grams of NaCl is added, and after mixing, they are put into a stainless steel ball mill tank of a ball mill, and the steel tank is ground with rubber After the ring is sealed, vacuumize to 0.1Pa, fill with argon, and the pressure is 0.9atm. Control the ball-to-material ratio to 20:1, and control the speed of the ball mill to 100 rpm. After ball milling for 5 hours, use a tablet press to make a φ20mm green body under an axial pressure of 4MPa, and put the green body at 1100°C in molten NaCl for 120 minutes. After the reaction, the cooled TiC / TiSi 2 Put the salt block of composite powder into water 10 times the weight of the salt block, and soak for 15 hours. After NaCl is completely dissolved in water. Filter out TiC / TiSi 2 Composite powder, TiC / TiSi 2 After the composite powde...

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Abstract

The invention belongs to the technical field of metal ceramic material preparation, and in particular relates to a method for preparing micro-nano TiC/TiSi2 composite powder. The method is characterized by comprising the preparation steps of preparing raw materials such as silicon powder, titanium powder and graphite powder, wherein the molar ratio of silicon powder to titanium powder to graphite powder is (1-4):(1.5-3):1, and the particle diameter of the silicon powder, the titanium powder and the graphite powder is more than or equal to 300 meshes; uniformly mixing the silicon powder, the titanium powder and the graphite powder; adding NaCl of which the addition is 1-2 times the total weight of mixed powder into the mixed powder obtained in the step (1), grinding the obtained mixture, uniformly mixing, and preparing into billets; putting the billets into molten sodium chloride with a temperature of 1000 DEG C, preserving heat for 60 minutes, and cooling to obtain a sodium chloride salt block carrying the TiC/TiSi2 composite powder; performing desalination treatment on the sodium chloride salt block carrying the TiC/TiSi2 composite powder, and removing sodium chloride to obtain the 100-500nano TiC/TiSi2 composite powder. The method disclosed by the invention is simple in process, low in preparation temperature, low in energy consumption and low in production cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of cermet materials, in particular to a method for preparing micro-nano TiC / TiSi 2 Method of composite powder. [0002] Background technique [0003] Metal nanopowders have poor dispersion, easy agglomeration, poor chemical stability, and poor compatibility with organic media, which greatly affect their application development. Preparation of TiC / TiSi by traditional method 2 Composite powder generally requires a high temperature above 1200°C, using pure silicon carbide, titanium and silicon as raw materials, which requires high temperature and high energy consumption. [0004] The paper "Microstructure and mechanical properties of in situ produced Ti 5 Si 3 / TiC nanocomposites" proposes the use of reaction hot pressing method to prepare Ti 5 Si 3 / TiC composite material, this method needs to apply a pressure of 35MPa in an argon environment and hold it at 1380°C for 1 hour to obtain Ti5...

Claims

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Application Information

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IPC IPC(8): C01B31/30C01B33/06C04B35/56C04B35/58C04B35/626C01B32/921
Inventor 杨瑞嵩杨杰李明田附青山刘春海崔学军金永中何勇王鹏王静婷
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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