Gradient nano composite ceramic tool material and preparation method thereof

A nano-composite, ceramic tool technology, applied in the field of composite ceramic tool materials, achieves the effects of relieving residual thermal stress, improving bending strength and fracture toughness, and improving thermal shock resistance

Inactive Publication Date: 2009-03-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the research on adding nanoparticles to functionally graded ceramic cutting tool materials to mak...

Method used

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  • Gradient nano composite ceramic tool material and preparation method thereof
  • Gradient nano composite ceramic tool material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1, three-layer symmetrical gradient structure

[0024] The volume content of TiCN in the central layer is 35%, Al 2 o 3 The volume content is 64%, the TiCN volume content of the two surface layers is 45%, Al 2 o 3 The volume content is 54%, the surface layer of nano-Al 2 o 3 Occupies the layer Al 2 o 3 20% of the total, MgO, Y in each layer 2 o 3 And the total volume content of NiO is 1%. Use deionized water as the dispersion medium to prepare nano-Al 2 o 3 The mass fraction is 0.2% suspension, adding relative nanometer Al 2 o 3 The dispersant of 2% by mass is sodium hexametaphosphate as the dispersant. Disperse on an ultrasonic dispersing mixer for 10 to 30 minutes, then remove the solution from the ultrasonic dispersing machine; adjust the pH value of the suspension to 7 to 11 to make the suspension alkaline. Micron Al 2 o 3 And TiCN and MgO, Y 2 o 3 , NiO and prepared nano-Al 2 o 3 Mix the suspension, disperse it on an ultrasonic disper...

Embodiment 2

[0026] Embodiment 2, three-layer symmetrical gradient structure

[0027] The TiCN content of the central layer is 30%, Al 2 o 3 The TiCN content of the two surface layers is 69%, the TiCN content of the two surface layers is 40%, and the Al 2 o 3 The content is 59%, the surface layer of nano-Al 2 o 3 Occupies the layer Al 2 o 3 10% of each layer of MgO, Y 2 o 3 And the total volume content of NiO is 1%. Using absolute alcohol as the dispersion medium, prepare nano-Al 2 o 3 The mass fraction is 0.2% suspension, adding relative nanometer Al 2 o 3 A dispersant with a mass of 0.1% uses sodium polyphosphate as a dispersant. When the powder is layered and filled, the ratio of the sum of the thicknesses of the two surface layers to the total thickness is 0.1. All the other processes are the same as in Example 1.

[0028] The mechanical properties of the prepared gradient nanocomposite tool material are: hardness HV18.6~19.4GPa, bending strength 710~800MPa, fracture tou...

Embodiment 3

[0029] Embodiment 3, three-layer symmetrical gradient structure

[0030] The TiCN content of the central layer is 50%, Al 2 o 3 The TiCN content of the two surface layers is 49%, the TiCN content of the two surface layers is 60%, and the Al 2 o 3 The content is 39%, the surface layer of nano-Al 2 o 3 Occupies the layer Al 2 o 3 30% of the total, MgO, Y of each layer 2 o 3 And the total volume content of NiO is 1%. Using absolute alcohol as the dispersion medium, prepare nano-Al 2 o 3 The mass fraction is 0.2% suspension, adding relative nanometer Al 2 o 3 A dispersant of 3% by mass, using sodium silicate as a dispersant. When the powder is layered and filled, the ratio of the sum of the thicknesses of the two surface layers to the total thickness is 0.5. All the other processes are the same as in Example 1.

[0031] The mechanical properties of the prepared gradient nanocomposite tool material are: hardness HV18.0~18.6GPa, bending strength 850~940MPa, fracture t...

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Abstract

The invention provides a gradient nano composite ceramic cutting tool material and a preparation method thereof, pertaining to the technical field of ceramic cutting tool materials. The cutting tool material has a symmetrical gradient layered structure, with the layer number of 3 or 5; according to volume percentage, the components of all the layers are 69 percent to 39 percent of AI2O3, 30 percent to 60 percent of micro TiCN, and 1 percent of micro MgO, micro Y2O3 and micro NiO; the layers which are symmetrical relative to the central layer have the same content of the components, and the thickness is symmetrically distributed, wherein, the AI2O3 of two surface layers is the mixture of nano AI2O3 and micro AI2O3, the volume content of the nano AI2O3 takes up 10 percent to 30 percent of the total AI2O3 volume content of the layer, and the AI2O3 of all the other layers is micro AI2O3; the TiCN content of each layer steadily increases layer by layer by 10 percent from the central layer to the outer layers, and the AI2O3 content steadily decreases layer by layer by 10 percent from the central layer to the outer layers. Powder layered filling in a laying way and hot pressed sintering technologies are adopted to prepare the material. The cutting tool material is characterized by uniform grain size distribution, high hardness, high bending strength, and good fracture toughness property and thermal shock resistance.

Description

technical field [0001] The invention relates to an alumina-titanium carbonitride gradient nanocomposite ceramic cutter material and a preparation method thereof, belonging to the technical field of composite ceramic cutter materials. Background technique [0002] Due to its unique properties such as high hardness, high wear resistance, high heat resistance and high chemical stability, the new ceramic tool material has the advantages of cemented carbide including coated tools in the field of high-speed cutting and cutting difficult-to-machine materials. Incomparable advantages of knives. Moreover, the raw materials of ceramic cutting tool materials such as Al, Si and other elements are the most abundant in nature, which can save the consumption of strategic precious metals. However, ceramic tool materials have low strength and toughness, high thermal expansion coefficient, poor thermal conductivity and thermal shock resistance, which limit their application range. At presen...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/56
Inventor 李艳征赵军张凯
Owner SHANDONG UNIV
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