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Non-spherical nickel powder for toughening zirconium oxide as well as preparation method and application of non-spherical nickel powder

A non-spherical, zirconia technology, applied in the interface reaction ability and bonding strength of metal nickel particles and ceramic matrix to improve the toughness of ceramics, in the field of zirconia materials, it can solve the problem that the metal strengthening mechanism cannot be effectively exerted, the bonding strength is reduced, and the oxygen vacancies are increased. and other problems, to achieve the effect of facilitating large-scale industrial application, improving mechanical properties, and simple process

Active Publication Date: 2021-06-18
HUNAN HENGJI POWDER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that in 3YSZ / Ni composites, the interfacial bonding between metallic nickel and zirconia is poor, on the one hand because nickel and zirconia do not undergo interfacial reactions (Lopez-E steban S., Rodriguez-Suarez T., Esteban-Beteg NF., et al..Mechanical properties and interfaces of Zirconia / Nickel in micro-andnanocomposites[J].Journal of Materials Science,2006,41(16):5194-5199.), on the other hand because During the vacuum sintering process, the oxygen vacancies in 3YSZ increased, resulting in the loss of Ni-O bond and the decrease of bonding strength (Pecharromnca, Be ltrn J., Esteban B., et al.Zirconia / Nickel Interfaces in Micro-and Nanocomposites[J].Zeitschrift Für Metallkunde, 2005, 96(5):507-514.)
These reasons lead to poor bonding between spherical nickel and 3YSZ matrix, so that during the fracture process, the nickel particles and the matrix are prematurely detached, so that the metal strengthening mechanism cannot be effectively exerted, and there is no obvious toughening effect.

Method used

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  • Non-spherical nickel powder for toughening zirconium oxide as well as preparation method and application of non-spherical nickel powder
  • Non-spherical nickel powder for toughening zirconium oxide as well as preparation method and application of non-spherical nickel powder
  • Non-spherical nickel powder for toughening zirconium oxide as well as preparation method and application of non-spherical nickel powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0039] A metal nickel powder for toughening zirconia and a preparation method thereof, the composite material is composed of a matrix 3YSZ and a non-spherical core-shell structure nickel powder. The amount of nickel powder added accounts for 5% of the total mass, the ratio of the long and short axes is 1.5:1, and the thickness of the oxide layer is 10nm.

[0040] The preparation method of the above-mentioned non-spherical core-shell structure nickel powder comprises the following steps: taking spherical atomized nickel powder and packing it into a stainless steel ball mill jar with a volume of 1L, and putting 1000g of stainless steel balls with a diameter of 5mm into the ball mill jar, using 5 : 1 ball-to-material ratio, with stearic acid as ball milling aid (consumption is 1wt.%), feeds Ar gas as protective atmosphere, ball mill rotating speed 150rpm, ball mill 2h, after complete cooling, take out ball mill powder and put into muffle furnace , heating up to 600° C. at 5° C. / m...

Embodiment 1-1

[0046] A metal nickel powder for toughening zirconia and a preparation method thereof, the composite material is composed of a matrix 3YSZ and non-spherical nickel powder. The amount of nickel powder added accounts for 10% of the total mass, the ratio of the long and short axes is 1.5:1, and the thickness of the oxide layer is 10nm.

[0047] The preparation method of the non-spherical nickel powder in this example and the preparation method of the composite material using the above-mentioned non-spherical nickel powder and 3YSZ are the same as those in Example 1.

[0048] Five samples were randomly selected from the same furnace to be tested, and the data collection method for the density, tensile strength and fracture toughness was to take 5 samples for measurement. The density of 5 samples is about 96.4-97.1%, the tensile strength is 759-770MPa, and the fracture toughness is 13.38-13.52MPa; the average density of 5 samples is 96.8%, and the average tensile strength is 785MPa...

Embodiment 1-2

[0050] A metal nickel powder for toughening zirconia and a preparation method thereof, the composite material is composed of a matrix 3YSZ and non-spherical nickel powder. The amount of nickel powder added accounts for 20% of the total mass, the ratio of the major axis to the minor axis is 1.5:1, and the thickness of the oxide layer is 10nm.

[0051] The preparation method of the non-spherical nickel powder in this example and the preparation method of the composite material using the above-mentioned non-spherical nickel powder and 3YSZ are the same as those in Example 1.

[0052] Five samples were randomly selected from the same furnace to be tested, and the data collection method for the density, tensile strength and fracture toughness was to take 5 samples for measurement. The density of 5 samples is about 96.5-97.2%, the tensile strength is 766-781MPa, and the fracture toughness is 12.38-12.52MPa; the average density of 5 samples is 96.1%, and the average tensile strength ...

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Abstract

The invention provides non-spherical nickel powder for toughening zirconium oxide as well as a preparation method and application of the non-spherical nickel powder. The invention belongs to the technical field of ceramic development. The non-spherical nickel powder has a core-shell structure, the surface layer of the non-spherical nickel powder is an oxide layer, and the core part of the non-spherical nickel powder is nickel. The preparation method of the non-spherical nickel powder comprises the steps that spherical nickel powder is subjected to ball milling and then oxidized to obtain the non-spherical nickel powder with the average particle size being 0.5-10 microns, the long-short axis ratio being (1.5-3.5): 1 and the surface nickel oxide thickness being 5-100 nm. The non-spherical nickel powder is used for toughening zirconium oxide. When the non-spherical nickel powder is used for toughening zirconium oxide, the bending strength and the fracture toughness of a product can be remarkably improved. The non-spherical nickel powder is reasonable in structural design, the preparation process is simple and controllable, the preparation cost is low, and large-scale industrial application is facilitated.

Description

technical field [0001] The invention belongs to the category of ceramic materials, relates to a zirconia material, and specifically relates to the reaction ability and bonding strength of the interface between metal nickel particles and ceramic substrates to improve the toughness of ceramics. Background technique [0002] Ductile metals not only contain the toughening mechanism of hard particles, but also include the crack tip shielding effect due to the plastic deformation zone, while the deformation, bridging and fracture of the plastic phase can absorb most of the fracture energy of the propagating crack (Gutierrez-Gonzalez C F ,Bartolome J F.Damage tolerance and R-curve behavior of Al 2 o 3 – ZrO 2 –Nb multiphase composites with synergistic tough ening mechanism[J].Journal of Materials Research,2008,23(2):570-578.). Therefore, metal-toughened ceramic matrix composites are considered to be one of the most promising approaches to improve the fracture toughness of cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/63C04B35/628C04B35/626C04B35/622C04B35/48
CPCC04B35/6303C04B35/62842C04B35/6261C04B35/6265C04B35/62675C04B35/48C04B35/622C04B2235/602C04B2235/656C04B2235/5436C04B2235/5445C04B2235/96C04B2235/77C04B2235/6562C04B2235/6581Y02P10/25
Inventor 何浩吴楚陈永志寻裕平
Owner HUNAN HENGJI POWDER TECH
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