Papers by Author: Xiao Ming Jia

Abstract: The main factors that affect properties of solid lubricant coating on high-speed steel surface are the surface roughness and the weight of phosphate coating. The effect of magnetic field on high speed steel phosphate process is significant. It promotes the film and the different appearance and composition of the film. Because the ferric phosphate and dihydric phosphate in phosphate solution may be ordered arrangement by additional magnetic field, they can be deposited on metal surfaces quickly. That is to say that a certain intensity of the magnetic field can reduce the entropy of the phosphate processing system and speed up the formation of phosphate film. During phosphate treatment, the friction performance of high-speed steel coated with solid lubricant coating was significantly improved.

Abstract: A new kind of high temperature solid lubricant coating was synthesized by adopting new technique and using graphite, MoS2, Sb2O3 and Al2O3. Its tribological behaviors and lubricate mechanism were studied by means of wear testers. The experiment results show that the friction coefficient of the solid lubricant coating decreases with the increase of load and slightly increases with the raise of temperature. The solid lubricant coating still has good lubrication in 400 .

Abstract: 9Cr2Mo steel is widely used as measuring and cutting tool steel. The friction and wear behavior of 9Cr2Mo steel was investigated under dry friction and solid lubricant by wear tester. The experiment results show that the friction coefficient of 9Cr2Mo steel is 0.34~0.58 under dry friction and 0.035~0.06 under solid lubricant. With the increase of load , the friction coefficient decreases and the wearing capacity increases under two kinds of conditions. The wearing capacity of 9Cr2Mo steel under solid lubricant is great lower than it under dry friction. The friction process is smooth under solid lubricant. It indicated that the solid lubricant took effect in antifriction and antiwear of 9Cr2Mo steel.

Abstract: The influence of some commonly used inhibitors on the tungsten carbide leaching of the cemented carbide tool was studied by energy spectrum analysis and electrochemical gaging. And the mechanism of the tungsten carbide leaching and be inhibited of the cemented carbide was discussed. The test results showed that when cemented carbide tool were soaked in tri-sodium phosphate and sodium carbonate anhydrous the tungsten carbide in the cemented carbide tool leached out for hydration. And benzotriazole has a good inhibitory effect on the tungsten carbide leaching of the cemented carbide tool.

Abstract: The reactionary trend of the triethanolamine and cobalt in cemented carbide and the mechanism of cobalt leaching have been investigated by soaking experiments, friction experiments and electrochemical gaging experiments. The experimental results reveal that triethanolamine is prone to form coordination compound with cobalt ion .The amount of cobalt’s element leaching from cemented carbide is added up with the increase of time and triethanolamine concentration. So when using cemented carbide cutting tool, the water-based cutting fluid containing triethanolamine addictive should be avoided.

Abstract: Grinding fluid is the essential supplementary material in cemented carbide grinding process. The amine-base additive can make cobalt leach from cemented carbide. Through grinding test, this paper mainly studies the influence of TEA-containing solution on cobalt leaching from cemented carbide and the leaching mechanism by SEM and AES, and then identifies the effective inhibitor. The results are as follows: (1) TEA additive can make cobalt leach from cemented carbide. (2) Additive of triethanolamine oleate in the solution can obviously inhibit the leaching of cobalt from cemented carbide. (3) Additive of benzotriazole in the solution can obviously inhibit the leaching of cobalt from cemented carbide. (4)The mixture of triethanolamine oleate, borax and benzotriazole has the best inhibition function. So it can conclude: The mixture of triethanolamine oleate, borax and benzotriazole can obviously reduce the leaching of cobalt from the cemented carbide, and reduce the danger of the fluid to human body.

Abstract: The cutting fluid is widely used in cutting process with the cemented carbide tool. This paper studied the influence of some antirusting aggents, such as triethanolamine, tri-sodium phosphate, benzotriazole, sodium carbonate anhydrous, on the cobalt leaching of the cemented carbide tool by soaking test. The test results showed that a cobalt on cememted carbide surface and triethanolamine can produce complex compound into solution that made the cobalt leaching. The cobalt of the cemented carbide with the ion of the tri-Sodium phosphate in a water solution can form the loose deposition which leaded to the cobalt leaching.The benzotriazole and the cobalt can generate complex compound film covering on cemented carbide to effective inhibits the cobalt leaching. The inhibitive effect about the cobalt leaching of the sodium carbonate anhydrous is carried out through cathode reaction. The cobalt leaching of cemented carbide tool is effective inhibited by adding the benzotriazole and the carbonate anhydrous in the water-based cutting fluid.

Abstract: Cutting fluid occupies an important position in the metal processing. The performance and pollution problem brought to the environment of cutting fluid are paid attention to day by day. Proceed from the perspective of green design, using castor oil which has a good biodegradability, triethanolamine, boric acid and the sodium polyacrylate whose molecular weight is less than 2×104 as the main raw materials, a boron-containing water-based cutting fluid had been obtained. The performance of B-containing water-based cutting fluid are measured according to GB/T6144-1985 regulation which is the technical requirements of synthetic cutting fluid. And the biodegradability of mineral oil, castor oil, modified castor oil and B-containing water-based cutting fluid are measured by improved Storstroem Test (OECD301B). The test results show that the B-containing water-based cutting fluid has a good performance of physical and chemical. And the biodegradation rate of the cutting fluid is 87%, which indicates the cutting fluid has a good biodegradability.

Abstract: This paper presents that the high-speed steel tools with solid lubrication material coating can cut without fluid because it has the quality of self-lubrication. With the help of M-2 friction and wearing testing machine and KYKY2800 scan electron microscope, the coating preparation technology and mixture ratio of solid lubrication material in complex coating can be optimized. The results show: phosphate treatment can increase the power of the tools’ surface adsorbing solid lubricant, and the frictional behaviour of solid lubrication coating is excellent when surface roughness of phosphate coating is Ra 2μm~Ra 4μm; molybdenum bisulfide, graphite and trioxid aluminium are mixed together and form a kind of complex coating which has better antifriction effect. The cutting test shows that the solid lubricant coating on the high-speed steel tools can be helpful in increasing the service life of the tools, decreasing the cutting resistance, and reducing the chip deformation and surface roughness of finished work.

Abstract: Using environment-friendly cutting fluid in the process of metal cutting is one of the valid paths to carry out the green manufacturing. Using metacrylic acid ester, castor oil and boride as the main raw materials, a new type of environment-friendly water-base cutting fluid had been obtained. The main components of this cutting fluid are some kind of high molecular polymer and some kind of B-containing castor oil EP agents. The test results show that the cutting fluid has good stability, antirust property and biodegradability. The maximal non-chucking load value (PB) of the cutting fluid, whose consistency is 5%, can be 1068N. In the comparison with dry cutting, cutting force using environment-friendly cutting fluid is reduced by 23% in a certain condition. Using this cutting fluid can raise stock-removing efficiency and cutting quality, and extend the service life of cutting-tool. And this cutting fluid is harmless to operators and free from pollution to the environment. Expansion and application of the environment-friendly cutting fluid are advantageous to promote the development of the green manufacturing.