Nickel-cobalt alloy/tetragonal zirconia polycrystalline 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 their preparation, can solve the problems of hydrogen safety that cannot be ignored, unsuitable for mass production, and high equipment cost, Achieve the effect of low equipment cost, safe preparation process and optimized microstructure

Inactive Publication Date: 2014-12-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 zirconia polycrystalline composite ceramic material and preparation method thereof
  • Nickel-cobalt alloy/tetragonal zirconia polycrystalline composite ceramic material and preparation method thereof
  • Nickel-cobalt alloy/tetragonal zirconia polycrystalline 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 zirconia polycrystalline composite ceramic material and a preparation method thereof. Tetragonal zirconia polycrystalline with 3% by mole of stable Y2O3, namely 3Y-TZP is taken as a base body, nickel-cobalt alloy Ni[1-x]Cox (x is 0.25-0.75) is taken as a second magnetic phase, and the mass percent of raw materials of the alloy is 1%-40%. The composite ceramic with excellent mechanical and magnetic properties is obtained by taking the tetragonal zirconia polycrystalline with stable Y as the base body, adding the magnetic phase of the nickel-cobalt alloy, and performing the two-step method of milling in a reducing atmosphere and sintering in an insert atmosphere. The magnetic property of the alloy is improved by adjusting the content of cobalt in the alloy, meanwhile, the mechanical property of the material is improved by adjusting the additive amount of the alloy in the zirconia base body, and finally the 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 Applications(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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