阅读说明：本技术 一种用于大尺寸高速重载薄壁齿轮低温气体渗碳的富化型渗剂 (Enriched type permeation agent for low-temperature gas carburization of large-size high-speed heavy-load thin-wall gear ) 是由 王鑫铭 刘克 杨兵 文涛 欧阳雪枚 于 2020-06-30 设计创作，主要内容包括：本项目提出了一种用于大尺寸高速重载薄壁齿轮温气体渗碳的富化型渗剂,属于化学热处理技术领域。所述催渗剂包括重量百分比含量5-8％稀土,10-20％四氯化碳,1-5％锆酸锂,异构醇余量。其中稀土是由90％的氧化镧和10％的氧化铈组成。以稀土、四氯化碳、锆酸锂和异构醇为原料,按照上述比例称取原料,混合均匀形成催渗剂,对大尺寸高速重载薄壁齿轮进行渗碳处理。本发明降低了渗碳温度,缩短渗碳时间,减小变形,进一步提高了表面硬度、耐磨性和疲劳性能,从而延长齿轮的使用寿命。(The project provides an enriched penetrating agent for warm gas carburizing of a large-size high-speed heavy-load thin-wall gear, and belongs to the technical field of chemical heat treatment. The catalytic agent comprises 5-8% of rare earth, 10-20% of carbon tetrachloride, 1-5% of lithium zirconate and the balance of isomeric alcohol by weight percentage. Wherein the rare earth is composed of 90% of lanthanum oxide and 10% of cerium oxide. Rare earth, carbon tetrachloride, lithium zirconate and isomeric alcohol are taken as raw materials, the raw materials are weighed according to the proportion and are uniformly mixed to form a penetration enhancer, and the large-size high-speed heavy-load thin-wall gear is subjected to carburization treatment. The invention reduces the carburizing temperature, shortens the carburizing time, reduces the deformation, and further improves the surface hardness, the wear resistance and the fatigue performance, thereby prolonging the service life of the gear.)

1. The rich permeation agent for raising low temperature gas carburizing speed of large size high speed heavy load thin wall gear features that the permeation agent includes RE in 5-8 wt%, carbon tetrachloride in 10-20 wt%, lithium zirconate in 1-5 wt% and isomeric alcohol in the rest.

2. The enriched carburizing agent for the low temperature gas carburizing speed of the large-size high-speed heavy-duty thin-wall gear according to claim 1, wherein the carburizing agent comprises, by weight, 6-7% of rare earth, 12-15% of carbon tetrachloride, 1-3% of lithium zirconate, and the balance isomeric alcohol.

3. The enriched carburizing agent for the low temperature gas carburizing speed of the large-size high-speed heavy-duty thin-wall gear according to claim 1, wherein the carburizing agent comprises, by weight, 6% of rare earth, 12% of carbon tetrachloride, 3% of lithium zirconate and the balance of isomeric alcohol.

4. The enriched carburizing agent for the low temperature gas carburizing speed of the large-size high-speed heavy-duty thin-wall gear according to claim 1 or 2, wherein the rare earth is composed of 90% of lanthanum oxide and 10% of cerium oxide.

5. The rich type carburizing agent for the low-temperature gas carburizing speed of the large-size high-speed heavy load thin-wall gear according to claim 1, 2 or 3, characterized in that the large-size high-speed heavy load thin-wall gear is carburized at 890-930 ℃ for 1-7 h.

Technical Field

Enriched type permeation agent for low-temperature gas carburization of large-size high-speed heavy-load thin-wall gear

Background

Carburizing is one of the most common heat treatment processes for case hardening of gears and many other parts. 90% of large-size high-speed heavy-load thin-wall gears need to be subjected to carburizing treatment. In production practice, engineers often adopt a method of carburizing and quenching tooth surfaces to improve the anti-failure capability of gear teeth of the gear, so as to improve the bearing capacity of the gear and prolong the service life. Particularly for large-size high-speed heavy-load thin-walled gears, how to improve the fatigue strength and control the deformation is an urgent problem to be solved on the premise of not influencing the carburizing speed. The heat treatment process is accelerated by an accelerating infiltration technology, which is an effective means for reducing the carburization temperature and energy consumption, wherein the rare earth infiltration agent is an infiltration agent which is researched and applied more at present. Rare earth is commonly used as a promoter because of the particularity of the distribution of the electronic structure, very low electronegativity and very strong chemical activity. When the porous silicon dioxide is added into a furnace together with the penetrating agent, the porous silicon dioxide can be fully cracked at 860 ℃. The rare earth has a cleaning effect on the surface of the workpiece, and the infiltration of carbon atoms to the surface of the workpiece is enhanced, so that the infiltration speed is improved. Under the same temperature, the speed of the low-temperature carburization of the rare earth is improved by about 30 percent compared with the speed of the ordinary carburization, and the electricity can be saved by 20 to 30 percent. On the premise of not influencing the production efficiency, the carburizing temperature is reduced, and the carburizing deformation can be effectively reduced. Lowering the carburization temperature reduces deformation mainly from three aspects: (1) the loss of the high-temperature strength of the workpiece is reduced, and the plasticity resistance is enhanced, so that the stress deformation resistance and the high-temperature creep resistance of the workpiece (the workpiece is deformed due to self weight or pressure, large and thin-wall parts are more remarkable), the comprehensive capacity is enhanced, and the deformation is reduced; (2) if the carburizing temperature is reduced, the temperature time for heating and cooling the workpiece is reduced, the temperature inconsistency of each part is also reduced, the caused thermal stress is also relatively reduced, and the deformation is reduced; (3) the time of the heat treatment process is shortened, the high-temperature creep time of the workpiece is reduced, and the deformation is also reduced.

Therefore, the invention provides an enriched catalytic agent for low-temperature gas carburization of a large-size high-speed heavy-load thin-wall gear, aiming at the problems of high carburization temperature, long production period, high energy consumption, large deformation and the like of the conventional large-size high-speed heavy-load gear. By adding the accelerant, the carburizing temperature is reduced, the carburizing time is shortened, the deformation is reduced, and the surface hardness, the wear resistance and the corrosion resistance are further improved, so that the service life of the gear is prolonged.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in the prior art, the energy consumption is large, the deformation is large, and the existing penetrating agent has the problems of complex formula, higher cracking temperature, lower activity, serious pipeline blockage and the like.

In order to solve the technical problem, the project provides an accelerant for low-temperature gas carburization of a large-size high-speed heavy-duty gear, and belongs to the technical field of chemical heat treatment. The catalytic agent comprises 5-8% of rare earth, 10-20% of carbon tetrachloride, 1-5% of lithium zirconate and the balance of isomeric alcohol by weight percentage. Wherein the rare earth is composed of 90% of lanthanum oxide and 10% of cerium oxide. The raw materials are weighed according to the proportion, uniformly mixed to form the energizer, and the large-size high-speed heavy-duty gear is carburized. The invention reduces the carburizing temperature, shortens the carburizing time, reduces the deformation, and further improves the surface hardness, the wear resistance and the fatigue performance.

The invention further prefers the accelerant agent, which comprises 6 to 7 weight percent of rare earth, 12 to 15 weight percent of carbon tetrachloride, 1 to 3 weight percent of lithium zirconate and the balance of isomeric alcohol.

The energizer for low-temperature gas carburizing of the high-speed heavy-duty gear comprises, by weight, 6-7% of rare earth, 12-15% of carbon tetrachloride, 1-3% of lithium zirconate and the balance of isomeric alcohol, wherein the rare earth is composed of 90% of lanthanum oxide and 10% of cerium oxide. The rare earth increases the carbon diffusion coefficient, so that the carburizing speed is increased, and the pollution to the oxygen probe made of zirconium dioxide is small. Therefore, the use of the energizer of the invention effectively reduces the carburizing temperature, reduces the carburizing deformation, avoids the problems of pipeline blockage and probe pollution and has economic and social significance for the precise manufacture of large-size high-speed heavy-duty gears on the premise of not influencing the production efficiency.

Drawings

FIG. 1 shows the metallographic structure of a core portion of 12CrNi3 carburized at 890 ℃ according to the invention.

FIG. 2 is the morphology of the carburized layer of the present invention carburized at 890 ℃ for 5h at 18CrNiMo 7.

Detailed Description