Silicon iron

Iron silicate Iron-silicon alloys Iron-silicon-chromium Iron sponge... 

Specialized alloys are used for high temperature appHcations on turbine blades, furnace parts, thermocouples, etc. These coatings can be as simple as iron—silicon—chromium or as exotic as chromium—aluminum—hafnium (36,41,52). 

Ratio of basic (calcium, sodium, potassium) to acidic (iron, silicon, aluminum) ash constituents, and specifically irou-to-calcium ratio... 

Internal surfaces were covered by loosely adherent corrosion product and deposit. Much of the corrosion product was cuprous oxide. Substantial amounts of iron, silicon, aluminum, zinc, and nickel were also found. Not unexpectedly, chlorine concentrations up to 2% by weight were present sulfur concentrations of about 1% were also found. 

The tlrree impurities, iron, silicon and aluminium are present in the metal produced by the Kroll reduction of zirconium tetrachloride by magnesium to the extent of about 1100 ppm. After dre iodide refining process tire levels of these impurities are 350, 130 aird 700ppm respectively. The relative stabilities of the iodides of these metals compared to that of zirconium can be calculated from the exchange reactions... 

Nickel/silicon alloy (10% silicon, 3% copper, and 87% nickel) is fabricated only as castings and is rather brittle, although it is superior to the iron/silicon alloy with respect to strength and resistance to thermal and mechanical shock. It is comparable to the iron/silicon alloy in corrosion resistance to boiling sulfuric acid solutions at concentrations above 60%. Therefore, it is chosen for this and other arduous duties where its resistance to thermal shock justifies its much higher price compared with iron/silicon alloys. 

Silicon used for diffusion treatment of carbon steels enhances corrosion resistance to sulfuric acid. Such a treatment has the surface durability of iron/silicon alloys without their marked brittleness. 

The major raw materials used at present for the production of alumina are bauxites, which are found in the following mineral forms gibbsite (Al(OH)3), boehmite (AlO OH), and diaspore (AlO OH). The major impurities are the oxides of iron, silicon, and titanium, and organic compounds, all of which must be removed before alumina is suitable for aluminum production. The process objectives are, therefore, separation of impurities and compound production in the present case. Bauxite is first dried to facilitate grinding, destroy organic matter, and oxidize the associated ferrous minerals to the ferric state. The temperature of drying is not allowed to exceed 150 °C, because at higher temperature a part of the combined water is expelled and the solubility is affected adversely. 

Phragm n, G. The Constitution of the Iron-Silicon Alloys. J. Iron Steel Inst. 114, 397 (1926). 

Yap, Ch. Ph. A Critical Study of Some Iron-Rich Iron-Silicon Alloys. J. physic. Chem. 37, 951 (1933). 

Acidifying the sample causes colloids and fine sediments that passed through the filter to gradually dissolve, yielding abnormally high concentrations of elements such as aluminum, iron, silicon, and titanium when the fluid is analyzed. Figure 6.4, from a study of this problem by Kennedy et al. (1974), shows how the pore size of the filter paper used during sample collection affects the concentrations determined for aluminum and iron. 

Hall (4) A process for making alumina by reducing bauxite with coke in an electric furnace. The co-product is an alloy of iron-silicon-aluminum-titanium. Invented by C. M. Hall in 1901 and later developed and commercialized by ALCOA. 

Af-dipropyl-p- toluidine, 2 550t a, a -dinitroanthraquinones, 9 315—316 a-alumina, 2 406t 14 103. See also Corundum transition to, 2 403 a-aluminum-iron—silicon alloys, 2 317 intermetallic phases, 2 316t a-aluminum oxide-hydroxide. 

Aluminum iodide pentadecahydrate, 2 386 Aluminum-iron alloys, 2 308-309 Aluminum-iron-silicon alloys, 2 316-317 a-Aluminum-iron-silicon alloys, 2 317 intermetallic phases, 2 316t P-Aluminum-iron-silicon alloys, 2 317 intermetallic phases, 2 316t Aluminum-killed steel, continuous-cast,... 

P-aluminum-iron-silicon alloys, 2 317 intermetallic phases, 2 316t P-aluminum oxide-hydroxide. 

The alloy used to make pop cans contains about 97% aluminum, by mass. The other elements in the alloy are magnesium, manganese, iron, silicon, and copper. 

Figure 10.5 Real-time image, with no computer processing, of magnetic domains and low-angle boundaries in iron-silicon taken using the Bede Scientific HI-RES detector at Daresbury Laboratory. The white radiation topograph was taken with X-rays of fundamental wavelength 1 A...

However, an alternative mechanism has been suggested to us by Prof. H. Saku-rai. It involves the homolytic cleavage of the iron-silicon bond Scheme 3). 

The hydrogen atom comes from the nucleophile and not from the complex. The iron-silicon complexes are cleaved by LiAlH with retention of configura-... 

In contrast, iron-silicon bonds are less labile. They are cleaved only by water with retention of configuration (59-66 %) affording siloxanes instead of silanols (L = CO) > ... 

When L = phosphine the complex is stable to water and, in all cases, iron-silicon complexes are inert to methanol. 

Energy losses in soft magnetic materials arise due to both hysteresis and eddy currents, as described in the previous section. Eddy current losses can be reduced by increasing the electrical resistivity of the magnetic material. This is one reason why solid-solution iron-silicon alloys ( 4% Si) are used at power frequencies of around 60 Hz and why iron-nickel alloys are used at audio frequencies. Some magnetically soft ferrites (see Section 6.2.2.1) are very nearly electrical insulators and are thus immune to eddy current losses. Some common soft magnetic materials and their properties are listed in Table 6.19. Soft magnetic alloys are described further in Section 6.2.1.6. 

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