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Nickel-cobalt alloy/tetragonal polycrystalline zirconia composite ceramic material and preparation method thereof

A nickel-cobalt alloy and composite ceramic technology, which is applied in the field of nickel-cobalt alloy/tetragonal polycrystalline zirconia composite ceramic materials and its preparation, can solve the problems of hydrogen safety that cannot be ignored, are not suitable for mass production, and have high equipment costs. Achieve the effects of low equipment cost, safe preparation process, and optimized microstructure

Inactive Publication Date: 2016-06-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment cost of hot pressing and sintering is relatively high, which is not suitable for mass production. At the same time, the safety issue of using hydrogen at high temperature cannot be ignored.

Method used

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  • Nickel-cobalt alloy/tetragonal polycrystalline zirconia composite ceramic material and preparation method thereof
  • Nickel-cobalt alloy/tetragonal polycrystalline zirconia composite ceramic material and preparation method thereof
  • Nickel-cobalt alloy/tetragonal polycrystalline zirconia composite ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Take the nickel-cobalt alloy powder whose cobalt doping ratio after reduction is 0.25 (that is, x=0.25), add it to 3Y-TZP, the mass percentage content of nickel-cobalt alloy is 10% of 3Y-TZP, put the green body in Sintering at 1400°C for 2 hours under the protection of argon in a vacuum carbon tube furnace yields a high-density nickel-cobalt alloy / tetragonal polycrystalline zirconia composite ceramic. Its relative density reaches 96.5%, its flexural strength reaches 650MPa, and its fracture toughness reaches 5.5MPam. 1 / 2 , the saturation magnetic field strength of the alloy in the composite material is 80.9emu / g, and the coercive field is 4.3Oe. Comparing this example with Comparative Example 1, it can be seen that when the strontium doping amount is 0.25, the mechanical properties of the material are improved, the saturation magnetic field strength is increased, and the addition of cobalt to form an alloy not only improves the mechanical properties, but also improves th...

Embodiment 2

[0032] Take the nickel-cobalt alloy powder whose cobalt doping ratio after reduction is 0.5 (that is, x=0.5), add it to 3Y-TZP, the mass percentage content of nickel-cobalt alloy is 10% of 3Y-TZP, put the green body in Sintering at 1400°C for 2 hours under the protection of argon in a vacuum carbon tube furnace yields a high-density nickel-cobalt alloy / tetragonal polycrystalline zirconia composite ceramic. Its relative density reaches 97.9%, its flexural strength is 801MPa, and its fracture toughness is 5.7MPam. 1 / 2 ,according to image 3 and Figure 4 The hysteresis loop can be read out, the saturation magnetic field strength of the alloy in the composite material is 95.7emu / g, and the coercive field is 16.8Oe.

Embodiment 3

[0034] Take the nickel-cobalt alloy powder whose cobalt doping ratio after reduction is 0.75 (that is, x=0.75), add it to 3Y-TZP, the mass percentage content of nickel-cobalt alloy is 10% of 3Y-TZP, put the green body in Sintering at 1400°C for 2 hours under the protection of argon in a vacuum carbon tube furnace yields a high-density nickel-cobalt alloy / tetragonal polycrystalline zirconia composite ceramic. Its relative density reaches 96.9%, its flexural strength is 581MPa, and its fracture toughness is 5.3MPam 1 / 2 , the saturation magnetic field intensity of the alloy in the composite material reaches 95.7emu / g, and the coercive field is 12.9Oe. According to Example 2 and this example, it can be seen that too much cobalt doping will improve the magnetic properties, but it will also reduce the mechanical properties of the material, so cobalt can not be doped too much.

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Abstract

The invention relates to a nickel-cobalt alloy / tetragonal polycrystalline zirconia composite ceramic material and a preparation method thereof. 2 o 3 The stable tetragonal polycrystalline zirconia, namely 3Y-TZP, is used as the matrix, and the nickel-cobalt alloy Ni 1-x co x (wherein x=0.25-0.75) is the second magnetic phase, and the mass percentage content of the raw material of the alloy is 1-40%. The invention uses yttrium-stabilized tetragonal polycrystalline zirconia as a matrix, adds nickel-cobalt alloy magnetic phase, and adopts a two-step method of reducing atmosphere powder making and inert atmosphere sintering to obtain composite ceramics with excellent mechanical and magnetic properties. The magnetic properties of the alloy are improved by adjusting the content of cobalt in the alloy, and at the same time, the mechanical properties of the material are improved by adjusting the addition amount of the alloy in the zirconia matrix, and finally a composite material with excellent mechanical and magnetic properties is obtained.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a nickel-cobalt alloy / tetragonal polycrystalline zirconia composite ceramic material and a preparation method thereof. Background technique [0002] At present, the miniaturization, integration and multifunctionalization of material devices have become the requirements for the development of the material field. For inorganic non-metallic materials, the integration of structure and function of ceramic materials can expand its application in high-tech fields, which has been highly concerned by researchers. Among them, magnetic particles are mixed into structural ceramics as the second phase to form a multi-phase composite ceramic of "magnetic particle dispersed phase / structural ceramic matrix", which has the functions of electromagnetic shielding, interference prevention or wave absorption while taking into account structural performance . The composite materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/12C04B35/48C04B35/622
Inventor 郭瑞松张超王姗姗杨月霞刘兰
Owner TIANJIN UNIV
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