Method for preparing aluminum oxide-titanium carbide-zirconium oxide nanocomposite ceramic material

A technology of nanocomposite and ceramic materials, applied in the field of material science, can solve the problems of limited application range, low fracture toughness, failure, etc.

Inactive Publication Date: 2010-10-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the early 1980s, the tool material research group of the former Shandong University of Technology used rapid hot-pressing sintering technology to prepare alumina-titanium carbide composite ceramic tool materials. The bending strength is greater than 900MPa, the hardness is HRA93.7-94.8, The toughness is 5.04MPa·m 1 / 2 , suitable for semi-finishing and finishing of high-strength steel (Ai Xing. Current status and prospects of high-speed cutting technology and tool materials. World Manufacturing Technology and Equipment Market, 2001, 6(3): 32-36), and pure alumina Compared with ceramics, its comprehensive performance has been greatly improved, but its relatively low fracture toughness limits its further application range
At room temperature, the toughening effect of zirconia is significant, but it decreases sharply with the increase of temperature. At about 800 ° C ~ 1000 ° C, the monoclinic phase will transform into tetragonal phase (m phase → t phase) Reverse phase change transformation, phase change toughening will fail, which limits the application range of zirconia
Although microcrack toughening is not affected by temperature, microcrack toughening will also cause a decrease in the hardness of ceramic materials, so the content of zirconia in ceramic materials is particularly important

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Submicron α-Al 2 o 3 (average particle size 0.5μm) 34.2vol%, nano-TiC (average particle size 140nm) is 59vol%, nano-ZrO 2 (average particle size 40nm) is 1.9vol%, molybdenum powder and nickel powder (average particle size 0.5μm) is 4vol%, the balance is MgO and Y 2 o 3 Proceed to the ingredients.

[0024] Slowly add the weighed nano-TiC into absolute ethanol, stir while adding, and prepare a suspension with a volume fraction of 2%, and then ultrasonically stir until uniform; polyethylene glycol is used as a dispersant, and its dosage is 0.8% by mass of nano-TiC, ultrasonically and stirred until uniform.

[0025] The weighed nano-ZrO 2 Slowly add in absolute ethanol, stir while adding, be prepared into a suspension with a volume fraction of 2%, and then ultrasonically stir until uniform; use polyethylene glycol as a dispersant, and its dosage is to disperse nano ZrO 2 1.4% by mass, sonicate and stir until homogeneous.

[0026] The prepared nano-TiC suspension, nan...

Embodiment 2

[0030] Submicron Q-Al 2 o 3 (average particle size 0.5μm) 34.1vol%, nano-TiC (average particle size 140nm) is 57vol%, nano-ZrO 2 (average particle size 40nm) is 4vol%, molybdenum powder and nickel powder (average particle size 0.5μm) is 4vol%, the balance is MgO and Y 2 o 3 Proceed to the ingredients.

[0031]Preparation of nano-TiC suspension is the same as in Example 1.

[0032] Preparation of Nano ZrO 2 The suspension is the same as in Example 1.

[0033] The prepared nano-TiC suspension, nano-ZrO 2 suspension, with submicron α-Al 2 o 3 , molybdenum powder and nickel powder, MgO and Y 2 o 3 Mix, and ultrasonically stir until uniform; ball mill and mix on a ball mill for 72 hours, vacuum dry, and sieve through a 120-mesh sieve to obtain uniformly mixed raw material powder.

[0034] Put the mixed raw material powder into a high-strength graphite mold, and use the hot-press sintering process to sinter in a vacuum hot-press sintering furnace. When the temperature is...

Embodiment 3

[0037] Submicron α-Al 2 o 3 (average particle size 0.8μm) 34.2vol%, nano-TiC (average particle size 140nm) is 59vol%, nano-ZrO 2 (average particle size 40nm) is 1.9vol%, molybdenum powder and nickel powder (average particle size 0.5μm) 4vol%, the balance is MgO and Y 2 o 3 Proceed to the ingredients.

[0038] Preparation of nano-TiC suspension is the same as in Example 1.

[0039] Preparation of Nano ZrO 2 The suspension is the same as in Example 1.

[0040] Ball milling and mixing are the same as in Example 1.

[0041] Put the mixed raw material powder into a high-strength graphite mold, and use the hot-press sintering process to sinter in a vacuum hot-press sintering furnace. When the temperature is below 1550°C, the heating rate is 75-110°C / min; when the temperature is above 1550°C, the heating rate is 30-50°C / min; keep warm at 960°C for 5 minutes, and start to pressurize slowly, and stop every time the pressure is 3MPa Pressurize, after it falls back to 1-2MPa, rep...

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Abstract

The invention belongs to the technical field of material science and relates to a method for preparing an aluminum oxide-titanium carbide-zirconium oxide nanocomposite ceramic material. The method is characterized by comprising the following steps of: mixing 30 to 40 volume percent of submicron alpha-Al2O3, 50 to 62 volume percent of nano-TiC, 1 to 4 volume percent of nano-ZrO2, 2 to 7 volume percent of molybdenum powder and nickel powder and the balance of MgO and Y2O3; and performing vacuum hot-pressing sintering by taking polyethylene glycol as a dispersant, wherein the temperature rise is between 75 and 110 DEG C/minute at the temperature of less than 1,550 DEG C; and the temperature rise is between 30 and 50 DEG C/minute at the temperature of more than 1,550 DEG C. The composite material has the advantages of high density, uniform particle size distribution, high hardness, high strength, high fracture toughness, high temperature resistance and the like and is suitable for manufacturing and processing a cutter made of difficultly-processed materials, particularly a cutter made of low-alloy and super high intensity hardened and tempered steel.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to a preparation method of an aluminum oxide-titanium carbide-zirconia nanometer composite ceramic material. Background technique [0002] Alumina ceramics have the advantages of high hardness, high wear resistance, good heat resistance, stable chemical properties and low cost, and are ideal materials for making cutting tools for difficult-to-machine materials. Researchers at home and abroad have made breakthroughs in the research and application of alumina ceramic materials in toughening and strengthening. The main theoretical achievements are: particle dispersion toughening and strengthening, phase transformation toughening and strengthening, and whisker toughening and strengthening. powerful. This greatly improves the strength and toughness of alumina ceramics, effectively overcomes the brittle defects of alumina ceramics itself, improves the reliability and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622
Inventor 刘维民艾兴赵军
Owner SHANDONG UNIV
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