Titanium powders

Titanium trifluoride is prepared by dissolving titanium metal in hydrofluoric acid (1,2) or by passing anhydrous hydrogen fluoride over titanium trihydrate at 700°C or over heated titanium powder (3). Reaction of titanium trichloride and anhydrous hydrogen fluoride at room temperature yields a cmde product that can be purified by sublimation under high vacuum at 930—950°C. 

Metals can be precipitated from the Hquid or gas phase. For example, nickel ammonium carbonate gives nickel powder when subjected to hydrogen in an autoclave. Copper, cobalt, molybdenum, and titanium powders can also be formed by precipitation. 

In the sheet-forming process, stainless steel, bronze, nickel-base alloys, or titanium powders are mixed with a thermosetting plastic and presintered to polymerize the plastic. Sintering takes place in wide, shallow trays. The specified porosity is achieved by selecting the proper particle size of the powder. Sheet is available in a variety of thicknesses between 16 x 30 mm and as much as 60 x 150 cm. A sheet can be sheared, roUed, and welded into different configurations. 

Titanium powder (0.626 g, 13.07 mmol) is suspended in 10 mb DME. Me3SiCl 14 (1.59 mb, 13.07 mmol) and (iPrO)3TiCl (9 mol%) are added and the mixture heated under reflux for 68 h under argon. 2-AcetylbenzaniHde 2091 (ca. 4 mmol) is added to this preactivated titanium reagent and the mixture is heated under reflux for 2.5 h. After filtration and evaporation of the filtrate the residue is chromatographed with hexane-ethylacetate (20 1) on silica gel to give 3-methyl-2-phenyl-indole 2092 as colorless crystals, m.p. 91-93 °C, in 97% yield [64] (Scheme 13.31). 

C by external cooling. During this process a part of the reduction occurs between titanium tetrachloride and sodium vapor and this leads to the formation of titanium powder. To avoid this, the reduction is carried out in two steps. Initially, stoichiometric amounts of sodium and titanium tetrachloride are metered into the steel retort at 700 to 750 °C to produce titanium dichloride ... 

Iodine and antimony powder react so violently as to cause ignition or explosion of the bulk of the mixture. A mixture of potassium and iodine explodes weakly on impact, while potassium ignites in contact with molten iodine [1], Interaction of molten iodine with titanium above 113°C under vacuum to form titanium tetraiodide is highly exothermic and sparks are produced. The preparative technique described permits the progressive reaction of 0.5 g portions of the titanium powder charged (7.2 g) to minimise hazard [2],... 

Titanium powder has ignited as a thin layer under carbon dioxide, and bums in the gas above 550°C [1]. Contact of titanium with fused alkali-metal carbonates causes incandescence [2],... 

Fiirstner has discovered that a low-valent titanium generated by pretreatment of titanium powder with Me3SiGl or Et3SiGl is effective for the McMurry coupling vide infra) ... 

RF-Plasma Torch Reactor. A diagram of a radiofrequency (RF) plasma torch reactor (25) is shown in Figure 8.1.3. The apparatus consists of an RF-plasma reactor with frequency of 4.0 MHz, a powder feeder, a gas supply system, and an exhaust system. The torch is composed of a work coil and three concentric quartz tubes for three independent gas flows outer, inner, and center carrier gas flows. For TiN UFPs synthesis, N2 is added to the outer flow of Ar, and titanium powder sieved in advance to a size less than 25 p.m is fed into the plasma by the carrier gas of Ar... 

Put the reduced copper into the middle part of porcelain tube 5 in furnace 6. What role should the copper gauze play A titanium powder can be used instead of the copper gauze. Titanium heated up to 500-600 °C in a nitrogen atmosphere forms a nitride that absorbs oxygen very well, transforming into titanium dioxide at 400-500 °C. 

Solid-state diffusion of carbon, nitrogen, or both carbon and nitrogen, into titanium powders at high temperatures (1270-1770 K) where the reaction takes place over the course of several hours.8-12 TiCN can also be produced by sintering a mixture of TiC and TiN 13 or by solid-state diffusional reactions in the systems of TiC + N2, TiN + C, and Ti + C + N2.14,15... 

To evaluate the effect of sample macroporosity, pressed titanium powder pellets of 45-70% relative density were combusted at 1 bar of nitrogen. Once initiated, the combustion wave front proceeded downward from the surface of the sample and converted Ti to TiN. Conversion was maximum at a relative density of about 58% (Figure 11.1) and the maximum... 

Technical, Powder , MIL-T-13405D (25 Jul 1977) 16) E.L. Thellmann, Titanium Powder... 

Thorium oxybromide, 1 54 Tin, as reducing agent for complex tungsten(VI) chlorides in preparation of complex potassium chlorotungstates(III), 6 149 Tin compounds, halomethyl derivatives, by the diazomethane method, 6 37 (CH8) 2 (CH2C1) SnCl, 6 41 Tin (IV) iodide, 4 119 Titanium, powder by reduction of titanium (IV) oxide with calcium, 6 47... 

Titanium cesium alum, 6 50 Titanium (II) chloride from disproportionation of titanium (III) chloride, 6 56, 61 Titanium(III) chloride, 6 52, 57 Titanium (IV) chloride, reduction of, with hydrogen, 6 52, 57 Titanium complex compounds, cations, with acetylacetone, [Ti-(C.H. hTiCl, and [Ti(C6H7-0,),]FeCl , 2 119, 120 Titanium(IV) oxide, extraction of, from ilmenite, 5 79, 81 to titanium powder with calcium, 6 47... 

The Sintox primer mixture contains tetracene, diazole, zinc peroxide/ titanium powder, and nitrocellulose ball powder.53 The use of this primer coupled with a totally jacketed bullet (base also enclosed) entirely eliminates the health hazard problem. 

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