Al2O3-TiC-TiN micron composite ceramic cutter material and microwave sintering method thereof

A technology of al2o3-tic-tin and composite ceramics, which is applied in the field of microwave sintering material science, can solve problems such as high temperature, long holding time, and affecting mechanical properties, so as to improve strength and fracture toughness, facilitate large-scale production, and improve production efficiency effect

Inactive Publication Date: 2014-11-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of hot pressing sintering is low, it is difficult to produce in large quantities and the cost is high
al 2 o 3 The sintering temperature of the matrix composite ceramic material is very high. Usually, the temperature of the pressureless sintering is higher, the heating rate is slower, and the holding time i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Submicron α-Al by mass percentage 2 o 3 55%, micron TiC 15%, submicron TiN 20%, molybdenum powder and nickel powder 5%, the balance is MgO and Y 2 o 3 For batching, the submicron α-Al 2 o 3 The particle size of the powder is 0.5 μm, the particle size of the micron TiC powder is 1 μm, and the particle size of the submicron TiN particle is 0.5 μm. The prepared mixed powder is ball milled and mixed with absolute ethanol as the medium for 30 hours, and the mass ratio of the ball to the material is 5:1. ; After ball milling, dry and sieve, add polyvinyl alcohol aqueous solution with a concentration of 3% to granulate; dry-press the granulated powder at a pressure of 150 MPa, and hold the pressure for 5 minutes; place the formed sample in microwave sintering In the furnace, turn on the vacuum pump to evacuate the furnace body to 0.07MPa, then turn on the microwave power supply for heating, heat the sample to 600°C at a speed of 20°C / min, and keep it warm for 5min. After ...

Embodiment 2

[0035] Submicron α-Al by mass percentage 2 o 360%, micron TiC 12%, submicron TiN 18%, molybdenum powder and nickel powder 8%, the balance is MgO and Y 2 o 3 For batching, the submicron α-Al 2 o 3 The particle size of the powder is 0.7 μm, the particle size of the micron TiC powder is 2 μm, and the particle size of the submicron TiN particle is 0.8 μm. The prepared mixed powder is ball milled and mixed with absolute ethanol as the medium for 48 hours, and the mass ratio of the ball to the material is 8:1. ; After ball milling, dry and sieve, add polyvinyl alcohol aqueous solution with a concentration of 4% to granulate; dry-press the granulated powder at a pressure of 200 MPa, and hold the pressure for 3 minutes; place the formed sample in microwave sintering In the furnace, turn on the vacuum pump to evacuate the furnace body to 0.08MPa, then turn on the microwave power supply for heating, heat the sample to 700°C at a speed of 25°C / min, and keep it warm for 15min. After ...

Embodiment 3

[0038] Submicron α-Al by mass percentage 2 o 3 65%, micron TiC 10%, submicron TiN 15%, molybdenum powder and nickel powder 10%, the balance is MgO and Y 2 o 3 For batching, the submicron α-Al 2 o 3 The particle size of the powder is 0.8 μm, the particle size of the micron TiC powder is 3 μm, and the particle size of the submicron TiN particle is 1 μm. The prepared mixed powder is ball milled and mixed with absolute ethanol as the medium for 60 hours, and the mass ratio of the ball to the material is 10:1; After ball milling, dry and sieve, add polyvinyl alcohol aqueous solution with a concentration of 5% to granulate; dry-press the granulated powder at a pressure of 250MPa, and hold the pressure for 1min; place the formed sample in a microwave sintering furnace During the process, turn on the vacuum pump to vacuum the furnace body to 0.09MPa, then turn on the microwave power supply for heating, heat the sample to 800°C at a speed of 30°C / min, and keep it warm for 20min. A...

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Abstract

The invention belongs to the technical field of microwave sintering materials, and relates to an Al2O3-TiC-TiN micron composite ceramic cutter material and a microwave sintering method thereof. The Al2O3-TiC-TiN micron composite ceramic cutter material and the microwave sintering method thereof are characterized in that material dosing is conducted by the materials, by weight, 55%-75% of submicrons, 10%-15% of microns, 15%-20% of submicrons, 5%-10% of molybdenum powder and nickel powder, and the balance MgO and Y2O3; through protection of high-purity argon atmosphere, the microwave sintering process is conducted, and the Al2O3-TiC-TiN micron composite ceramic cutter material is successfully prepared. The Al2O3-TiC-TiN micron composite ceramic cutter material is high in compactness, high mechanical property is achieved, and the material is suitable for being using for manufacturing and processing cutters of materials difficult to process. The Al2O3-TiC-TiN micron composite ceramic cutter material prepared by the microwave sintering method is high in material performance, simple in process, saving in energy and time, low in cost, and prone to industrialization.

Description

technical field [0001] The invention belongs to the field of microwave sintering material science and technology, and relates to an Al 2 o 3 - TiC-TiN micro-composite ceramic tool material and microwave sintering method thereof. Background technique [0002] al 2 o 3 Ceramic-based knives have many advantages, such as high temperature resistance, high hardness, good adhesion resistance, and wear resistance 5 times higher than ordinary carbide. It has always occupied a large share in all kinds of ceramic cutting tool materials developed at home and abroad. However, low fracture toughness has always been the main factor restricting the application and development of alumina-based ceramic materials. [0003] The Al used as a cutting tool reported so far 2 o 3 Most of the matrix composite ceramics are obtained by hot-press sintering. Hot-press sintering simultaneously pressurizes and heats to facilitate mass transfer processes such as contact, diffusion and flow between pa...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F3/10C22C29/12
Inventor 程寓孙士帅
Owner NANJING UNIV OF SCI & TECH
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