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Nanoparticles containing iron-based powder metallurgy technology of direct carburizing

Case,[link widoczny dla zalogowanych], the crystal dislocation occurs. Particle motion through the whole row of atoms or the slip planes to achieve mass transfer; also be involved in a liquid phase sintering, the liquid wetting and dissolution of solid phase, the formation of the neck ridicule. In contrast, solid-phase sintering mainly through contact with the formation of atomic diffusion between the particles sinter neck formation more difficult, while the liquid phase sintering because the liquid surface tension and wetting and dissolution of a large role in solid phase, more easily in the grain between the sintering neck. So as to create conditions for further spread of the atom. Lower the melting point of the nano-powder. Nano powder in the process of liquid phase sintering sintering sintering of its major components; and because of its small particle size, the surface is greater. More than larger particles with dissolved solid phase capacity, making it easier to form a sinter neck Wen; In addition, the liquid phase sintering process also includes a solid-phase sintering process, so. And mainly through solid-phase sintering sintered powder samples without Jia Nami compared. Jia Nami powder samples can be completed at a lower temperature sintering. The addition of nano-powder samples at a relatively low sintering temperature can be successful. The gas carburizing is usually under 900 ~ 950 ℃. Therefore, the process of the specimen is a direct carburizing sintering process. Carburizing process is completed the protective gas atmosphere to avoid decarburization gas (such as CO:,[link widoczny dla zalogowanych], H20, O Smile

serious impact on the specimen. Decarburization reaction of carbon and gas gas, will be formed near the particle surface and the hole. This not only reduces the density of the sample also resulted in holes caused by the decrease of hardness. 3 Conclusions (1) nano Fenti Fe Huo Cu (0.5% ~ 1%) can Xiangdi sintering temperature, ie from the original sintering temperature (1180 ℃) down to 920 ℃, lower energy consumption and costs. (2) direct carburization of parts of its density and hardness has improved significantly. (3) combined carburizing process and the sintering process can reduce the production process. References: l】【James, BrianW. Recentdevelopmentsinfelrouspowdermetallurgyalloys 【. 『】. InternationalJournalofPowderMetallurgy,[link widoczny dla zalogowanych], 1994,30 (2) :157-162. 【2】 Zhao. Motorcycle Camshaft J】【Improvement of Heat Treatment. Heat Treatment of Metals, 2001, (1): 42 -. 43. 【3】 Huang Shimin. Application and development of powder metallurgy technology 【. 『】. Aviation technology, 1999, (4) :36-38. 【4] Mao Zhiqiang. Powder metallurgy parts in automotive applications 【. 『】. Powder metallurgy industry, 2o03, l3 (1): 8 · l1. 【5】 DavidWhittaker. ProcesseconomicsandtechnologicaladvancesinP / Mautomotiveparts】【J. InternationalJournalofPowderMetallurgy, 1998,34 (4) :53-56. 【6】 Mars, Owe. Hpc Yu squirt rib ceP / Msteels 【. 『】. ScandinavianJournalofMetallurgy, 1995,24 (4) :147-151. Tian Patent Name: The electrical contact heating method to obtain the inner surface of the aluminized steel pipe layer method patent application number: CN200410054890.0: Public Number: CN1587433 Application Date: 2004.07.30; Open Date: 2005.03.02 applicant : Dalian Jiaotong University, the present invention relates to a heating method using electrical contact to obtain the inner surface of the aluminized steel pipe coating. Particularly in the pipe filled with aluminized steel inner surface of the agent or brushing with a certain thickness of aluminized binder agent were adjusted: and then the two ends of the pipe connected to the power cooling after its heat insulation,[link widoczny dla zalogowanych], the pipe access to the inner surface of aluminized layer on the method of the present invention by electrical contact heating method to obtain the inner surface of the aluminized steel pipe layer technology; includes the steps of A will go to the inner surface of the oil pipe to rust and its activation, step B inside the pipe will be filled after activation through the mixing amount of aluminum or aluminum alloy containing powder aluminizing agent or brushing the surface of the steel tube with a certain thickness are aluminized adhesive transfer agent; steps C to pipe connection on the power supply. Be heated to a certain temperature, after thermal cooling. In the tube to obtain a certain depth within the surface of aluminized layer. ((Hot processing technology \
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