Method for preparing ceramic coat with biphase gradients of zirconia and alumina on surface of zirconium base

A technology of ceramic coating and preparation process, which is applied in the field of zirconia-alumina dual-phase gradient coating material and its micro-arc oxidation preparation, which can solve the problems of low friction coefficient, questionable safety, and unavailability, and achieve high combination The effect of intensity

Inactive Publication Date: 2007-12-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although metals represented by cobalt-chromium-molybdenum alloys, stainless steel and titanium alloys have good strength and toughness, they have low hardness and poor wear resistance.
Alumina (Al 2 o 3 ) has high hardness (about 20GPa) and low friction coefficient, but its strength is low, toughness is poor, and it is prone to fragmentation
Tetragonal zirconia (t-ZrO 2 ) is more than twice as strong and tough as alumina, and its hardness is about 12GPa. It...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 0.1M NaAlO 2 with 0.1M Na 2 HPO 4 Aqueous solutions are mixed to make an electrolyte.

[0015] With zirconium or zirconium alloy as the anode and stainless steel as the cathode, a pulse power supply is used at a constant voltage of 300V and an initial current density of 6mA / mm 2 , the frequency is 100Hz, the duty ratio is 20%, and the distance between the cathode and anode plates is 8cm, the zirconium or zirconium alloy is subjected to micro-arc oxidation treatment, the temperature of the electrolyte is maintained at 15°C, and the treatment time is 25 minutes. Or form a "zirconia-alumina" dual-phase gradient ceramic coating with a thickness of 40 μm on the surface of the zirconium alloy.

Embodiment 2

[0017] 0.2M NaAlO 2 with 0.05M Na 2 HPO 4 Aqueous solutions are mixed to make an electrolyte.

[0018] With zirconium or zirconium alloy as the anode and stainless steel as the cathode, a pulse power supply is used at a constant voltage of 350V and an initial current density of 7mA / mm 2 , the frequency is 50Hz, the duty ratio is 15%, and the distance between the cathode and anode plates is 10cm, the zirconium or zirconium alloy is subjected to micro-arc oxidation treatment, the temperature of the electrolyte is maintained at 20°C, and the treatment time is 40 minutes. Or a "zirconia-alumina" dual-phase gradient ceramic coating with a thickness of 50 μm is formed on the surface of the zirconium alloy.

Embodiment 3

[0020] 0.4M NaAlO 2 with 0.02M Na 2 HPO 4 Aqueous solutions are mixed to make an electrolyte.

[0021] With zirconium or zirconium alloy as the anode and metal stainless steel as the cathode, a pulse power supply is used at a constant voltage of 450V and an initial current density of 12mA / mm 2 , the frequency is 200Hz, the duty ratio is 35%, and the distance between the cathode and anode plates is 12cm, the zirconium or zirconium alloy is subjected to micro-arc oxidation treatment, the temperature of the electrolyte is maintained at 30°C, and the treatment time is 60 minutes. Or form a "zirconia-alumina" dual-phase gradient ceramic coating with a thickness of 70 μm on the surface of the zirconium alloy.

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Abstract

This invention discloses a process for preparing zirconium oxide-aluminum oxide biphase gradient ceramic coating on the surface of zirconium-based material. The process comprises: preparing an electrolyte, supplying zirconium or zirconium alloy as the anode and metal stainless steel as the cathode (spacing = 8-12 cm), and performing micro-arc oxidation treatment on zirconium or zirconium alloy at an electrolyte temperature of 15-40 deg.C, a constant voltage (supplied from an impulse power supply) of 300-650 V, an initial current density of 6-20 A/mm2, a frequency of 50-1000 Hz, and a duty ratio of 5-40% for 25-90 min to obtain the product. The zirconium oxide-aluminum oxide biphase gradient ceramic coating is composed of t-ZrO2 and alpha-Al2O3 biphase, and the content of alpha-Al2O3 biphase is decreased from the surface to the matrix. The zirconium oxide-aluminum oxide biphase gradient ceramic coating has a nanoporous structure and no interface with the matrix, and thus has high combination strength and high hardness (above 1200 Hv).

Description

technical field [0001] The invention relates to the composition and preparation method of a zirconia-alumina dual-phase gradient coating on the surface of a zirconium base, in particular to a zirconia-alumina dual-phase gradient coating material used on the surface of zirconium and zirconium alloy components and its Micro-arc oxidation preparation process. Background technique [0002] The hip and knee joints are the main load-bearing and wear parts of the human body, and have the highest damage rate among all kinds of joints. Replacement prosthesis used to restore its function - artificial hip and knee joints are composed of joint head, joint socket and joint stem. Among them, the joint head and the joint socket are mainly subject to wear, so it is required that the constituent materials have strong wear resistance, low wear particle generation rate, sufficient strength and toughness, and good biocompatibility to ensure a long service life. [0003] Artificial hip and kne...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 闫元媛憨勇吕春国黄娟娟
Owner XI AN JIAOTONG UNIV
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