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Alloy invar

In the Premier Mill the rotor is shaped hke the frustrum of a cone, similar to that in Fig. 20-53. Surfaces are smooth, and adjustment of the clearance can be made from 25 [Lm (0.001 in) upward. A small impeller helps to feed material into the rotor gap. The mill is jacketed for temperature control. Direct-connected hquid-type mills are available with 15- to 38-cm (6- to 15-in) rotors. These mills operate at 3600 r/min at capacities up to 2 mVh (500 gal/h). They are powered with up to 28 kW (40 hp). Working parts are made of Invar alloy, which does not expand enough to change the grinding gap if heating occurs. The rotor is faced with Stellite or silicon carbide tor wear resistance. For pilot-plant operations, the Premier Mill is available with 7.5- and 10-cm (3- and 4-in) rotors. These mills are belt-driven and operate at 7200 to 17,000 r/min with capacities of 0,02 to 2 mVh (5 to 50 gal/h). [Pg.1864]

The pressure sensitivity of the magnetic properties of the Invar alloys is indicated by extensive measurements of the coefficient of saturation magnetization change with pressure M dMJdP for various compositions as shown in Fig. 5.10. The exceedingly large values in the 30%-40% Ni range are evident and much in excess of the values for iron and nickel. The 30-wt% Ni composition in the fee phase is the most sensitive to pressure, whereas this... [Pg.115]

Fig. 5.10. The pressure dependence of saturation magnetization for iron-nickel alloys shows a strong pressure dependence in the neighborhood of the Invar alloys (28.5 to 40-at. % nickel in the fee phase). The shock data shown are in excellent agreement with the static high pressure data (after Wayne [69W01]). Fig. 5.10. The pressure dependence of saturation magnetization for iron-nickel alloys shows a strong pressure dependence in the neighborhood of the Invar alloys (28.5 to 40-at. % nickel in the fee phase). The shock data shown are in excellent agreement with the static high pressure data (after Wayne [69W01]).
The well defined change in compressibility of the fee alloy at 2.5 GPa clearly indicates the expected behavior of a second-order phase transition. The anomalously high value of the compressibility for the pressure-sensitive fee alloy is demonstrated in the comparison of compressibilities of various ferromagnetic iron alloys in Table 5.1. The fee Ni alloy, as well as the Invar alloy, have compressibilities that are far in excess of the normal values for the... [Pg.119]

Miodownik, A. P. (1978a) in Honda Memorial Volume on Metal Science and Metallurgy, in Physics and Application of Invar Alloys, ed. Saito (Maruzen, Tokyo) 3(18), p. 429. Miodownik, A. P. (1978b) ibid. 3(12), p. 288. [Pg.193]

PMS liquids are corrosion-inert substances. Under normal conditions and heated to 100-150 °C they do not cause corrosion and for a long period of time do not change in airflow when in contact with aluminum and magnesium alloys, bronzes, carbon and doped steels, as well as titanium alloys. PMS liquids do not change their properties under 100 °C in air for 200 hours in contact with the above-listed alloys as well as with beryllium, bismuth, cadmium, Invar alloy, brass, copper, mel-chior, solder, lead, silver. The stability of the properties of PMS liquids in these conditions is usually accompanied by the absence of metal and alloy corrosion, although the colour of the metal surface may slightly change. [Pg.167]

The concentration dependence of A reveals the feature similar to the invar alloy Fe-Ni at Ni concentration of 40%. [Pg.267]

A summary of the magnetic phase transitions in the Invar alloy is thus that all transitions occur at much lower volumes than the ferromagnetic ground state volume, except the spin-flip transition, which is predicted to occur somewhere around this equilibrium volume, and which must therefore be taken into account in models for the Invar behaviour. [Pg.95]

G.J. Kwon, H.Y. Sun, H.J. Sohn, Wall profile developments in through mask electrochemical micro machining of invar alloy films, J. Electrochem. Soc. 142 (9) (1995) 3016-3020. [Pg.82]

This system is of interest for a number of industrial applications, principally commercial alloyed steels (Invar alloys), which lie in the Co-Fe rich part of the system, and thermoelectric materials, compositions of which lie in the silicon rich part. [Pg.20]

The use of Invar alloy for liquid piping eliminates a need for flexible bellows sections. As a result, we could anticipate favorable costs and reliability. [Pg.297]

The term invar alloys is used for some groups of alloys characterized by having temperature-invariant properties, either temperature-independent volume (invar) or temperature-independent elastic properties (elinvar) in a limited temperature range. A comprehensive survey of the physics and applications of invar alloys is given in [3.17]. [Pg.780]

Crystalline invar alloys are essentially based on 4 binary alloy systems Fe—Ni, Fe—Pt, Fe—Pd, andFe—Co, containing a few percent of Cr. Figure 4.3-34 [3.17] shows the thermal expansion coefficient of these invar type alloy systems. The invar alloy in each system is fee... [Pg.781]

Fe-Ni-Based Invar Alloys. An iron alloy eontaining 34 to 36.5wt%Ni is well known as a eommereial invar material. The materials C < 0.12 wt%, Mn < 0.50 wt%, and Si < 0.50 wt% are generally added for metallurgical purposes. Figure 4.3-35 [3.41] shows the thermal expansion curves of some Fe—Ni alloys. [Pg.782]

The thermal expansion of invar alloys is affected significantly by the addition of third elements. [Pg.782]

Fig. 4.3-38 Effect of thermal annealing at a temperature and of mechanical treatment on the thermal expansion of Fe-36 at.% Ni invar alloy [3.41]... Fig. 4.3-38 Effect of thermal annealing at a temperature and of mechanical treatment on the thermal expansion of Fe-36 at.% Ni invar alloy [3.41]...
Table k.3-25 Themal expansion coefficient, a and mechanical properties of invar alloys for practical use [3.42]... [Pg.783]

Table 4.3-27 Some physical properties of invar alloys [3.17] ... Table 4.3-27 Some physical properties of invar alloys [3.17] ...
Fig. 4.3-39 The displacement of the Curie point ATc vs. pressure in Fe—Ni invar alloys [3.43] and in Fe—Co—Cr invar alloy [3.44]. The results for Ni [3.43] and for a 30Mn—Fe alloy [3.44] are also shown for comparison. Numerical values in parentheses show the Curie or Neel point at atmospheric pressure... Fig. 4.3-39 The displacement of the Curie point ATc vs. pressure in Fe—Ni invar alloys [3.43] and in Fe—Co—Cr invar alloy [3.44]. The results for Ni [3.43] and for a 30Mn—Fe alloy [3.44] are also shown for comparison. Numerical values in parentheses show the Curie or Neel point at atmospheric pressure...
Thermal expansion coefficients of invar 36 and free-cut invar 36 (containing S and P, or Se) between 25 and 900 are listed in Table 4.3-26 [3.17]. Some physical properties of Invar alloys are given in Table 4.3-27 [3.17]. [Pg.784]

In order to improve the corrosion resistance of invar alloys, stainless invar was developed. The basic composition is Fe-54 wt% Co-9.5 wt% Cr. Stainless invar has the bcc structure at room temperature in the equilibrium state. As an invar material, it is used after quenching from a high temperature to retain the fee structure [3.17]. [Pg.784]

Fe-Pt-Based Invar Alloys. Among the ordered phases of the Fe—Pt system (Fig. 4.3-41 [3.17]), the Fc3Pt phase shows the invar type thermal expansion anomaly. In... [Pg.784]

Fe-Pd-Based Invar Alloys. Alloys of Fe—Pd (see Fig. 4.3-43) containing 28 to 31 at.% Pd show invar characteristics, as seen in Fig. 4.3-44 [3.41]. In order to obtain invar behavior, the alloys are quenched from the high terr5)erature y phase field such that phase transformations at lower temperatures are suppressed. As shown in Fig. 4.3-45 [3.41], the thermal expansion is strongly decreased by cold deformation, i. e., by disordering, lattice defects, and internal stresses. After cold working, an instability of the invar property is observed. [Pg.785]

H. Saito (Ed.) Physics and Application of Invar Alloys (Maruzen Company, Ltd., Tokyo 1978)... [Pg.815]


See other pages where Alloy invar is mentioned: [Pg.123]    [Pg.124]    [Pg.61]    [Pg.189]    [Pg.45]    [Pg.260]    [Pg.263]    [Pg.222]    [Pg.237]    [Pg.40]    [Pg.288]    [Pg.95]    [Pg.61]    [Pg.91]    [Pg.124]    [Pg.516]    [Pg.283]    [Pg.664]    [Pg.668]    [Pg.682]    [Pg.780]   
See also in sourсe #XX -- [ Pg.315 ]




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