Wood’s alloy

For dehydration, place the platinum (nickel) crucible with the prepared salt ( 5 g) into a test tube with a standard ground-glass joint (Fig. 63). Preliminarily weigh the crucible and the salt with an accuracy up to 0.01 g. Connect the test tube to a vacuum system. Evacuate it (10- mmHg) first at room temperature during 10-20 min, and then at 150 °C on an oil bath or a bath with Wood s alloy. Dehydrate the substance up to a constant mass. Calculate the composition of the product according to the change in its mass. 

Fusible Alloys. —Among the eutectic alloys, some are known as fusible alloys. Wood s alloy consists of two parts of tin, two of lead, seven or eight of bismuth, and one or two of cadmium it melts at 66°- ] i ° an alloy melting at 6o° (Lipowitz s) consists of tin four parts, lead eight parts, bismuth fifteen parts, and cadmium three parts. 

Parker and A. V. Rhead (ibid., 1914, 105, 2150) used thin strips of Wood s alloy, melting-point 72° 0. These were made by pouring the molten alloy down the channel produced by folding a piece of paper at an angle of 60 C. 

Figure 11-19 (a) Wood s alloy castings of a 0.127-m-length core showing the pathway that acid etched through the core, (b) Simulation results showing channeling in the network for the transport-limited case. 

Switching to lithium-alloy negative electrodes, some voltage loss must be noted. LiAl has Uu = -1-385 mV, Li4.5Pb has Uu = 388 mV. Entries 18-20 in Table 10(b) represent three examples of rechargeable cells, which have been, at least temporarily, commercialized. The first (No. 18) is due to a lithium alloy/carbon black battery conunercialized by the Matsushita Co. [248]. The lithium alloy components are Pb -I- Cd -I- Bi -h Sn (Wood s alloy). Button cells in the range 0.3 to 2.5 mAh were offered. The electrolyte was LiC104 in an unknown solvent. The practical energy densities, 2Wh/kg, were rather low. The c.b. positive electrode acts as a double... 

Monel metal Constantan Nichrome Manganin Wood s alloy Rose s alloy... 

The test is performed with 0.2 g of a sample that is previously dried and ground to a suitable particle size. The sample, placed in a test tube, is immersed in a liquid metal bath (usually Wood s alloy) vdien the temperature in the bath reaches 100 °C. Three samples are tested simultaneously. An electric motor connected with a Beckman thermometer provides the heating rate of either 5 °C/min or 20 °C/min. When the ignition of the sample occurs, accompanied by a crack or whistle, the temperature is read out from the control thermometer. 

FIGURE 7.29 The immersion depth of a bit, h, as a function of time (1) in the course of the drilling stainless steel that is dry, (2) in Vaseline oil, (3) in emulsion, and in metallic melts (4) Wood s alloy, (5) tin, (6) gallium, (7) indium, (8) In-Ga-Sn eutectic, (9) Sn-Pb eutectic, and (10) Sn-Zn eutectic. (Data from Shchukin, E.D. (Ed.), The Successes of Colloid Chemistry and Physical-Chemical Mechanics, Nauka, Moscow, Russia, 1992.)... 

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