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

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...

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.

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