Technology for coating ZrO2/Fe2O3 composite film on surface of diamond by sol-gel method

A sol-gel method and a composite thin film technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of high production cost, limited protection performance of diamond abrasives, weak bonding force between the film layer and the ceramic bond, etc. Improved wettability, enhanced holding force, and good wettability

Inactive Publication Date: 2013-12-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coated metal film is very easy to react with the vitrified bond during the sintering process of the ceramic abrasive, so that the bonding strength between the bond and the diamond abrasive does not increase much.
[0004] Some people also used the sol-gel method to coat TiO on the diamond surface. 2 Thin films and TiO 2 /Al 2 o 3 film, the oxidation resistance of diamond abrasives treated by this process has been greatly improved, but TiO 2 It is difficult for the film to form a bond with the diamond matrix, and the bonding force between the film and the diamond is low; at the same time, TiO 2 The wettability with the vitrified bond is not very good; Al 2 o 3 Although the wettability of the film with the vitrified bond is good, it will chemically react with the alkali metal oxide in the vitrified bond during the sintering process of the vitrified bonded diamond grindin

Method used

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  • Technology for coating ZrO2/Fe2O3 composite film on surface of diamond by sol-gel method
  • Technology for coating ZrO2/Fe2O3 composite film on surface of diamond by sol-gel method
  • Technology for coating ZrO2/Fe2O3 composite film on surface of diamond by sol-gel method

Examples

Experimental program
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Example Embodiment

[0025] Example 1

[0026] See figure 1 In the embodiment of the present invention, a sol-gel method is used to plate ZrO on the diamond surface 2 / Fe 2 O 3 The process of composite film includes the following steps:

[0027] (1) Surface treatment of the diamond abrasive: first immerse the diamond abrasive in hot sulfuric acid with a temperature of 80°C and a concentration of 98%, and activate the surface for 1 hour, and then rinse the surface of the abrasive with deionized water. Until the cleaning solution is neutral, use ultrasonic waves with a frequency of 80KHz to clean the abrasive surface in anhydrous ethanol medium for 1 hour, and dry the cleaned diamond abrasive at 70°C for later use;

[0028] (2) Preparation of Fe 2 O 3 Sol and coated Fe 2 O 3 Thin film: pure FeCl will be analyzed 3 The powder is dissolved in HCl solution with a concentration of 1mol / L to prepare FeCl 3 The solution with a concentration of 5wt%, stir at high speed for 1 hour, and then add FeCl under the cond...

Example Embodiment

[0031] Example 2

[0032] See figure 1 In the embodiment of the present invention, a sol-gel method is used to plate ZrO on the diamond surface 2 / Fe 2 O 3 The process of composite film includes the following steps:

[0033] (1) Surface treatment of the diamond abrasive: first immerse the diamond abrasive in hot sulfuric acid with a temperature of 90℃ and a concentration of 99%, and activate the surface for 1.5 hours. Then rinse the surface of the abrasive with deionized water. Until the pH of the cleaning solution is 7.0, use ultrasonic waves with a frequency of 90KHz to clean the abrasive surface for 1.5 hours in anhydrous ethanol medium, and dry the cleaned diamond abrasive at 80°C for use;

[0034] (2) Preparation of Fe 2 O 3 Sol and coated Fe 2 O 3 Thin film: pure FeCl will be analyzed 3 The powder is dissolved in a HCl solution with a concentration of 1.5 mol / L to prepare FeCl 3 For a solution with a concentration of 6wt%, stir at high speed for 1.5 hours, and then add FeCl und...

Example Embodiment

[0037] Example 3

[0038] See figure 1 In the embodiment of the present invention, a sol-gel method is used to plate ZrO on the diamond surface 2 / Fe 2 O 3 The process of composite film includes the following steps:

[0039] (1) Surface treatment of diamond abrasive: first immerse the diamond abrasive in hot sulfuric acid with a temperature of 70°C and a concentration of 90%, activate the surface for 0.5 hours, and then rinse the surface of the abrasive with deionized water. Until the pH of the cleaning solution is 6.5, use ultrasonic waves with a frequency of 70KHz to clean the abrasive surface for 0.5 hours in anhydrous ethanol medium, and dry the cleaned diamond abrasive at 60°C for use;

[0040] (2) Preparation of Fe 2 O 3 Sol and coated Fe 2 O 3 Thin film: pure FeCl will be analyzed 3 The powder is dissolved in a 0.5mol / L HCl solution to prepare FeCl 3 The solution with a concentration of 4wt%, stir at high speed for 0.5 hours, and then add FeCl under high speed stirring 3 Add a...

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Abstract

The invention discloses a technology for coating a ZrO2/Fe2O3 composite film on the surface of diamond by a sol-gel method. The technology comprises the following steps of preparing stable Fe2O3 sol by FeCl3 hydrolysis, dipping a diamond abrasive subjected to surface treatment into the Fe2O3 sol, carrying out drying and calcination on the diamond abrasive to obtain a diamond abrasive of which the surface is uniformly coated with a Fe2O3 film, preparing stable ZrO2 sol by ZrOCl2 hydrolysis, dipping the diamond abrasive of which the surface is uniformly coated with the Fe2O3 film into the ZrO2 sol, and carrying out drying and calcination on the diamond abrasive to obtain the diamond abrasive coated with the ZrO2/Fe2O3 composite film. The ZrO2/Fe2O3 composite film can prevent the diamond abrasive from a harmful chemical reaction with a ceramic binder in sintering, improve wettability of the diamond abrasive and the ceramic binder, improve the diamond abrasive holding capacity of the ceramic binder, and prolong a service life of a diamond ceramic grinding tool.

Description

technical field [0001] The invention relates to a diamond abrasive surface modification technology, in particular to a ZrO coating on the diamond surface by a sol-gel method. 2 / Fe 2 o 3 Composite film process. Background technique [0002] Diamond is the hardest substance among all materials, so it is often used to make processing tools. However, synthetic diamonds are mainly in the form of particles and powders, which must be combined with a material called a binder and prepared into a tool with a certain shape and strength. Commonly used binder materials are metals, resins and ceramics. Among them, the vitrified bonded diamond grinding wheel has the characteristics of high elastic modulus, stable chemical properties, water resistance, heat resistance, acid resistance, low cost, strong self-sharpening, and small grinding force. It is especially suitable for non-metallic materials or composite materials. Precision grinding. However, compared with the commonly used res...

Claims

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Application Information

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IPC IPC(8): C09K3/14C04B41/89
Inventor 刘小磐
Owner HUNAN UNIV
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