CN-116555740-B - Preparation process of wear-resistant reinforced self-lubricating sulfur-based film

Abstract

The invention relates to a preparation process of a self-lubricating sulfur-based film with enhanced wear resistance, which comprises the steps of firstly preparing titanium dioxide (TiO 2 ) sol by using titanium dioxide (TiO 2 ) powder, putting activated iron-carbon alloy into a composite plating solution containing titanium dioxide (TiO 2 ) sol, carrying out water bath heating treatment, and preparing the sulfur-based lubricating film with enhanced wear resistance on the surface of the iron-carbon alloy through a post-treatment process. The invention aims to solve the problems that the traditional coating has poor mechanical property and is easy to generate larger cracks, and the coating has insufficient tribological property under heavy load working conditions, and the mechanical strength and the wear resistance of the prepared sulfur-based lubricating film are obviously improved.

Inventors

• ZHANG GUOTAO
• LU ZHENG
• MA ZHEN
• TONG BAOHONG
• JIANG TING
• CHEN SHUAIFENG
• ZHANG ZAN

Assignees

• 安徽工业大学

Dates

Publication Date

20260512

Application Date

20230410

Claims (2)

1. 1. The preparation process of the wear-resistant reinforced self-lubricating sulfur-based film is characterized by comprising the following operation steps of: (1) Preparation of Titania sols Adding 10g of titanium dioxide powder into 150mL of absolute ethyl alcohol, adding nitric acid to adjust the pH value to 3, heating to 70 ℃ in a water bath, stirring 40min at the speed of 4500r/min, standing and aging 72: 72 h to obtain light yellow titanium dioxide sol; (2) Preparation of activated iron-carbon alloy material Polishing the surfaces of the iron-carbon alloy materials by using abrasive paper with 180 meshes, 400 meshes and 2000 meshes respectively in sequence to obtain the iron-carbon alloy materials with bright metallic luster on the surfaces, namely the to-be-treated parts; Soaking and pickling in a hydrochloric acid solution with the concentration of 2%, wherein the pickling time is 20-30 s; activating in hydrochloric acid solution with the concentration of 3% -5%, wherein the activation time is 10-15 s, washing with deionized water, vacuum drying and drying to obtain an activated iron-carbon alloy material; (3) Preparing a plated part Uniformly mixing 2-5 g of thioacetamide, 3-5 g of sodium thiosulfate, 5-8 g of ferrous chloride, 0.5-1 g of acid, 1-2 g of graphite powder, 0.2-0.6 g of sodium hydroxide, 0.01-0.02 mg of sodium dodecyl sulfate, 20-50 mL of titanium dioxide sol and 100mL of deionized water to obtain a composite plating solution; the acid is one of maleic acid, citric acid or glycine; placing the activated iron-carbon alloy material into a composite plating solution, heating in a water bath to 50 ℃, starting magnetic stirring, and plating for 120 min to obtain a plated piece; (4) Post-treatment Placing the plated part into a resistance furnace, and carrying out heat preservation and heat treatment for 1h at the temperature of 300 ℃ under the protection atmosphere of nitrogen, placing into lubricating oil, and cooling to room temperature to obtain a self-lubricating sulfur-based film with wear resistance enhancement on the surface of the plated part; The thickness of the self-lubricating sulfur-based film is 15-20 mu m, and the hardness is 350-500 HV; The wear-resistant reinforced self-lubricating sulfur-based film contains 40-60% by mass of iron, 15-30% by mass of sulfur, 5-15% by mass of titanium, 10-18% by mass of oxygen and 3-8% by mass of carbon.
2. 2. The process for preparing the wear-resistant reinforced self-lubricating sulfur-based film according to claim 1, wherein in the step (1), the particle size of the titanium dioxide powder particles is 400-450 nm.

Description

Preparation process of wear-resistant reinforced self-lubricating sulfur-based film Technical Field The invention belongs to the technical field of mechanical basic friction surface treatment, and particularly relates to a preparation process of a self-lubricating sulfur-based film with enhanced wear resistance. Background According to scientific statistics, 70% -80% of energy is consumed due to friction in the running process of various machines, so that not only is the resource wasted, but also fatigue wear of the mechanism is increased, and the safety guarantee and the service life of the machines are greatly reduced. With the continuous development of the technology level and the continuous expansion of the production field, people gradually realize the importance of antifriction lubrication. Surface engineering is a very important antifriction means. FeS lubricating films and Ni-P wear-resistant films which are emerging in recent years can effectively improve tribological performance, but in some heavy-load environments, the films fall off early due to insufficient mechanical strength of the films, so that the tribological effect is not ideal. As found by research, feS films can improve lubricity and prevent seizure or abrasion of the friction surface during operation. However, under some high-load conditions, the internal phase structure of the workpiece is changed, the friction coefficient of the friction surface is increased, the FeS film is rapidly peeled off or adhered to the surface of other workpieces, and the antifriction effect is greatly reduced. In order to improve the mechanical properties of the film, a common method is to add hard nano particles into the film. For example, a formula of Ni-P-TiO 2 composite plating solution for copper alloy surface and plating process, another Ni-P-PTFE-TiO 2 composite nano-plating layer, and the invention lays a research foundation for preparing high-performance Ni-P-TiO 2 composite plating film. Because titanium dioxide (TiO 2) nano particles have higher surface energy, agglomeration is very easy to occur, so that titanium dioxide (TiO 2) nano particles are unevenly distributed in a coating, more cracks are easy to induce on the surface, and when the cracks reach a certain number, a matrix is exposed, and the mechanical property and the lubricating effect of the film are affected. How to solve the problem of nanoparticle dispersibility, development of a hard reinforced self-lubricating film is to be developed. Disclosure of Invention In order to improve the mechanical strength and the wear resistance of the soft sulfur-based film, solve the problems that the traditional plating layer is poor in mechanical property and easy to generate larger cracks, and make up the problem of insufficient tribological property of the plating layer under the heavy-load working condition, the invention provides a preparation process of the wear-resistant reinforced self-lubricating sulfur-based film. The preparation operation steps of the self-lubricating sulfur-based film with enhanced wear resistance are as follows: (1) Preparation of Titania sols Adding 10g of titanium dioxide (TiO 2) powder into 150mL of absolute ethyl alcohol, adding nitric acid to adjust the pH value to 3, heating to 70 ℃ in a water bath, stirring 40: 40 min at the speed of 4500r/min, standing and aging 72: 72 h to obtain pale yellow titanium dioxide (TiO 2) sol; (2) Preparation of activated iron-carbon alloy material Polishing the surfaces of the iron-carbon alloy materials by using abrasive paper with 180 meshes, 400 meshes and 2000 meshes respectively in sequence to obtain the iron-carbon alloy materials with bright metallic luster on the surfaces; Soaking and pickling in a hydrochloric acid solution with the concentration of 2%, wherein the pickling time is 20-30 s; activating in hydrochloric acid solution with the concentration of 3% -5%, wherein the activation time is 10-15 s, washing with deionized water, vacuum drying and drying to obtain an activated iron-carbon alloy material; (3) Preparing a plated part Uniformly mixing 2-5 g of thioacetamide, 3-5 g of sodium thiosulfate, 5-8 g of ferrous chloride, 0.5-1 g of acid, 1-2 g of graphite powder, 0.2-0.6 g of sodium hydroxide, 0.01-0.02 mg of sodium dodecyl sulfate, 20-50 mL of titanium dioxide sol and 100mL of deionized water to obtain a composite plating solution; the acid is one of maleic acid, citric acid or glycine; placing the activated iron-carbon alloy material into a composite plating solution, heating in a water bath to 50 ℃, starting magnetic stirring, and plating for 120 min to obtain a plated piece; (4) Post-treatment And (3) placing the plated part into a resistance furnace, carrying out heat preservation and heat treatment for 1h at the temperature of 300 ℃ under the protection atmosphere of nitrogen, and placing into lubricating oil and cooling to room temperature to obtain the self-lubricating sulfur-based film with the wear res