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Process for preparing zirconium oxide coating of titanium alloy surface

A titanium alloy and zirconia technology, which is applied in the field of preparation of zirconia coatings on the surface of titanium alloys, can solve problems such as poor biocompatibility, thermal influence of the substrate, and poor bonding of the substrate.

Inactive Publication Date: 2007-04-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium alloy has low surface hardness and poor wear resistance, and its biocompatibility is not ideal as an artificial bone material.
For this reason, people have carried out a lot of research on the surface strengthening technology of titanium alloys, such as plasma spraying, laser melting and other physical methods to prepare zirconia coatings, but the physical methods are complicated in equipment, high in cost, and have a thermal impact on the substrate. Sol- The zirconia coating prepared by chemical methods such as gel has the problem of not being firmly bonded to the substrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific embodiment 1: This embodiment is achieved in the following way: a. Take 1-11ml phosphoric acid and dissolve it in distilled water to make 1L solution, then add 5-10g potassium hexafluorozirconate while stirring to obtain electrolyte; b 1. Wash the TC4 titanium alloy substrate with hydrofluoric acid to remove the oxide film and then place it in the electrolyte as the positive electrode, the stainless steel plate as the negative electrode, and the temperature-controlled electrolyte range is 10-40°C; Adjust the current density to the specified value within ~10 minutes, that is, the peak voltage is -200 ~ 600V, the average current density of the positive phase or positive and negative phase is 700 ~ 900A / M 2 . The frequency is 50-60Hz, and the reaction is 10-90 minutes under constant current; d. Take it out and wash it and dry it naturally or at 80-100°C.

specific Embodiment approach 2

[0005] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that 1ml of phosphoric acid (85%) is dissolved in distilled water to form a 1L solution, and then 5g of potassium hexafluorozirconate is added while stirring, positive and negative The current density is 800A / M 2 , energized and reacted for 10 minutes under a constant current to obtain a ceramic layer with a thickness of 8 μm. Other process steps and parameters are the same as those in Embodiment 1. This embodiment adopts the rapid cooling and rapid heating method to evaluate the bonding strength. First, heat the electric furnace to 1000°C, quickly place the sample in the electric furnace, take it out after 1 minute of heat preservation, and immediately put it into 10°C cold water for rapid cooling, and thermal shock resistance cycles three times. The layer did not fall off.

specific Embodiment approach 3

[0006] Specific embodiment three: the difference between this embodiment and specific embodiment one is that 7ml of phosphoric acid (85%) is dissolved in distilled water to make 1L solution, and then 6g of potassium hexafluorozirconate is added while stirring, positive and negative The current density is 800A / M 2 , under constant current for 10 minutes of energization reaction, the thickness of the obtained ceramic layer is 10 μm, and the ceramic layer does not fall off after ten cycles of thermal shock resistance. Other process steps and parameters are the same as those in Embodiment 1.

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Abstract

The method of preparing the coat of zirconia on the surface of the titanium alloy relate to the preparation technique of the coat of zirconia on the surface of the titanium alloy, including such steps as 1 to 11ml / L phosphoric acid into the distilled water and adding the 5 to 10g / L hexad fluorin Potassium zirconic acid to get the electrolyte; putting the titanium alloy as the anode into the electrolyte, choose the stainless steel as the cathode and control the temperature between 10deg.C and 40deg.C; powering on the bi-directional pulse power, adjusting the peak voltage between -200V to 600V, the average current density of the normal phase or the normal and negative phase between 700A / M2 and the frequency between 50Hz and 60Hz and for 10 minutes to 90 minutes with constant current; washing it with water and drying it in natural condition or at the temperature of 80deg.C to 100deg.C. The invention uses the titanium alloy to react with, forms the transition layer on the surface directly, increases the combination intensity of the coat of zirconia and the substrate and reaches the aim of function of the structure material.

Description

technical field [0001] The invention relates to a preparation process of a zirconia coating on the surface of a titanium alloy. Background technique [0002] Zirconia has excellent thermal and mechanical properties. The phase transition between low-temperature monoclinic and medium-temperature tetragonal phases will cause a volume change of about 3% to 5% (volume fraction), often leading to the generation of microcracks, which is conducive to material toughness. As a porous catalytic film, it is mainly used in the catalytic reaction of the chemical oxidation process, which can significantly reduce the resistance of the electrolyte and increase the power of the single cell; it can be directly used as a biologically inert coating material, and does not occur or occurs very slightly in body fluids The biochemical reaction can exist stably for a long time. Zirconia is a coating material with great development potential both in the field of structural materials and functional ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D9/08
Inventor 姜兆华姚忠平孙学通吴晓宏
Owner HARBIN INST OF TECH
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