Carbonitriding of porous materials based on iron

Conclusions Carbonitriding of sintered materials should provide a high level of impregnation with nitrogen; the level of carbon impregnation is of secondary importance and in order to provide minimum deformation it should be low. In order to obtain high mechanical properties and operating characteristics for equipment the following carbonitriding schedule is suitable; carbon potential 0.4–0.5% C, nitrogen potential 0.7–0.8% N, temperature 860°C, duration 1 h.Production Association AvtoZIL. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 31–33, May, 1990.     

Magnetically soft powder materials based on the Fe-Si-Al system

The magnetic properties, structure, and distribution of elements in powder alloys of the Fe-Si-Al system are studied. The concentration nonuniformity of the distribution of silicon and aluminum in the stage of sintering is determined after the introduction of alloying additives in the form of ferroalloys. The components forming a liquid phase in the stage of sintering and reducing the concentration sensitivity of the magnetic properties are chosen in order to create a powder sendast. Acomparative analysis of the properties of the fabricated and commercial alloys is made. __________ Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 23–26, March, 2006.     

Extracting heavy metals with cellulose-containing materials

Sorptivity of cellulose-containing materials of heavy metal ions from diluted electrolyte solutions is studied. Capacity and kinetic characteristics of the sorbents are estimated. The limiting stage of the adsorption of copper and nickel ions is shown to have a mixed nature. These sorbents are found to provide a high degree of metal ion removal. Original Russian Text ? N.A. Bagrovskaya, O.V. Alekseeva, O.V. Rozhkova, A.N. Rodionova, S.A. Lilin, 2008, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2008, Vol. 44, No. 4, pp. 423–427.     

Carbonitriding of iron-base powder materials

Conclusion To strengthen iron-base powder materials it is desirable to use a short carbonitriding operation.I. A. Likhachev Moscow Automobile Plant, Production Union. The Plant Higher Technical School at the I. A. Likhachev Moscow Automobile Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 37–39, July, 1984.     

Cladding of aluminum substrates with iron based wear resistant materials using controlled short arc technology

For lightweight constructions aluminum alloys are established since many years. Seal face and inlays, made of wear resistant materials, are commonly used to reach a partial wear protection for aluminum components. Problems concerning this approach are the necessary space and the endurance strength of the inlay-part joint. An alternative for the replacement of the inlays by cladding using innovative and easy to handle short arc technology will be discussed in this paper. The presented technology offers the potential to control the energy input into the substrate and so the formation of brittle intermetallic phases which occur in the aluminum-steel interface. The usage of wear resistant iron based feedstock materials enables further applications due to advantageous physical and mechanical properties. In the experiments the aluminum alloy AlSi8Cu3 was cladded with stainless steel and a nanocrystalline solidifying wear resistant iron based alloy using the coldArc equipment. Due to the low heat input, intermetallic phases could be minimized using stainless steel as cladding material as well as nanocrystalline solidifying iron based material. Further investigations in the resulting interface section, which did not exceed 10 µm, had been carried out by using SE-microscopy and energy-dispersive X-ray analysis.     

钛粉制取低铁镁的探讨

钛粉能有效地去除粗镁中的铁。粗镁中杂质多,渣量大,精炼中钛粉使用期短,消耗量大,低铁镁产量低。本文介绍的方法是对钛粉制取低镁工艺的改进,低铁镁制取的钛粉消耗明显降低。     

Lamellar compounds of graphite with alkali metals as catalysts for polymerization of organocyclosiloxanes

The polymerization of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, 1,3,5-trimethyl-1,3,5-triphenylcyclotrisiloxane and 1,3,5-trimethyl-1,3,5-tris(3,3,3-trifluoropropyl)cyclotrisiloxane in the presence of lamellar graphite-alkali metal compounds has been investigated. Negatively charged graphite layers rather than alkali metal atoms are supposed to constitute the active polymerization centers. A cyclic structure is proposed for the polymers.     

Microalloying of Low-Carbon Low-Alloy Steels with Titanium

Metal Science and Heat Treatment - The effect of up to 0.18% microadditions of titanium on the structure and mechanical properties of sheet low-carbon (0.07 – 0.09% C) steels with different...     

铁粉对药芯焊丝发尘率的影响

测试了市售的3种不同厂家的药芯焊丝的发尘率,研究了铁粉添加量对焊丝发尘率的彭响。并对烟尘进行了等离子电感耦合光谱分析和X射线衍射物相分析。研究结果表明：烟尘中铁的氧化物约占50％。当药芯焊丝中的w(Fe)=19．5％-28．7％时,焊丝发尘量为5．5226-8．2326g／kg;实验条件下铁粉在药芯中所占比例越小,单位质量的焊丝发尘量就越少;不同厂家、不同工艺生产的铁粉时发尘量没有明显的影响。     

Effect of powder alloy composition on the microstructure and properties of kinetic sprayed Cu-Ga based coating materials

This study attempted to manufacture Cu-Ga coating materials via the kinetic spray process and examined the effect of powder alloy composition on the microstructure and properties of the kinetic sprayed Cu-Ga based coating materials. Cu-15 at%Ga, Cu-20 at%Ga, and Cu-30 at%Ga powders were prepared and used. Annealing heat treatments were conducted at 200 °C~800 °C. The results showed that the coating layers could be manufactured with Cu-15 at%Ga and Cu-20 at%Ga powders via the kinetic spray process, except for Cu- 30 at%Ga. A single phase of pure Cu was observed in the Cu-15 at%Ga coating layer and Cu and Cu₃Ga phases in the Cu-20 at%Ga coating layer. A small amount of Ga₂O₃ was also detected between deposited particles in both coating layers. It was difficult to obtain the coating layer due to the shattering of powders during the kinetic spraying with Cu-30 at%Ga powder, which is made up of a variety of inter-metallic compounds. Porosity and hardness decreased as the annealing temperature increased, and porosity decreased into 0.48% (Cu-15 at%Ga), 0.74%(Cu-20 at%Ga) at 800 °C. Annealing heat treatment appeared to be effective in enhancing the density of the coating layers without generating a new phase. This study also considered to suggest the optimal alloy composition of kinetic sprayed Cu-Ga based coating material for sputtering target.     

含氮铁基粉末冶金材料的组织和性能研究

通过气体渗氮法对还原铁粉进行渗氮得到含氮铁基粉末,再对该粉末进行冷等静压成形并在保护气氛中烧结制备出含氮铁基粉末冶金材料.研究表明:该材料的成分为Fe、Fe4N和少量的Fe2O3.其硬度是一般的铁基粉末冶金材料的1.6倍、耐磨性约为铁基粉末冶金材料的5倍、抗蚀性提高约10倍,且该材料的比饱和磁化强度为199.6emu/kg.