Nickel tests

In addition to the patch test for nickel sulphate, intradermal nickel tests have been used [407, 408]. The intradermal testing was recommended for confirmation of doubtful patch-test reactions, particularly to disclose false positive reactions. 

Figure 2. Effect of temperature on methane production rate using sprayed Raney nickel. Test conditions pressure, 300 psig flow, 2000 std cc/hr N2 water, 5.8 and 1.16 grams/hr.

Figure 16.2 The creep curve and structural parameters as a function of time for nickel. Tests at temperature T = 673 K (0.39 T ) stress o = 130 MPa (1.7 x 10 V)-...

Figure 16.3 Subgrain in nickel tested at temperature 1073 K, stress 20 MPa. Screw dislocations along the [101] direction are denoted as B. 33 000 x.

Fig. 11-41 Device for the homogeneous gamma irradiation of the sodium.contained in nickel test tubes, in view of the simultaneous determination of carbon and nitrogen...

Fig. 11-42 Apparatus used to communicate a helicoTdal movement to the nickel test tube behind the platinum target...

Fig. 11-43 Rotation device for the homogeneous irradiation of the central part of the sodium contained in the nickel test tube which is moved by a pneumatic circuit, in view of the oxygen determination... 

The sample is reduced in a hydrogen stream at 800°C in the presence of a nickel catalyst. The ammonia formed is detected by coulometry and the test sensitivity is on the order of one part per million. 

The sensitivity tests are carried out on artificial defects (nickel-chromium specimens of NFA 09.520,see figure 3 of annex 1) and natural defects (one part in "light" alloy, one part in stellite grade 1 containing micropores, 2 specimens of fracture mechanical type CT20 in Z2 CN 12.10 (NFA 03.180). 

The tables 5 and 6 give the results of sensitivity tests obtained on the nickel-chromium specimens of 20 and 10 pm for the fluorescent range products, and of 50 and 30 pm for the colored range of products. 

Table 6 classification in terms of decreasing sensitivity performances of coloured products obtained on the Nickel-chromium specimens of 50 et 30 pm Tests realized on nickel-chomium specimens of 20pm with coloured products don t change the classification. 

The sensitivity test on nickel-chromium test blocks show that products which give bad results to over washing tests generally do not give good results to sensitivity tests. 

For coloured product family selection is made on nickel-chromium specimen of 30 pm, but for fluorescent product family selection is made on nickel-chromium specimen of 10 pm. Tests made on real defects confirm these results. 

In this paper, the performanees of laser-ultrasound are estimated in order to identify lacks of weld penetration. The laser-ultrasonic technique is applied to cylindrical metallic strucmres (few mm thick) in a single-sided control. The results obtained for different materials (gold-nickel alloy and tantalum) are presented by B-sean views for which the control configuration is discussed with regard to the thermal effects at the laser impact. This testing is performed for different lacks of weld penetration (up to 0.5 mm for a thickness of 2 mm) even in the presence of the weld bead, which corresponds to an actual industrial problem. 

This paper deals with the control of weld depth penetration for cylinders in gold-nickel alloy and tantalum. After introducing the experimental set-up and the samples description, the study and the optimization of the testing are presented for single-sided measurements either in a pulse-echo configuration or when the pump and the probe laser beams are shifted (influence of a thermal phenomenon), and for different kind of laser impact (a line or a circular spot). First, the ultrasonic system is used to detect and to size a flat bottom hole in an aluminium plate. Indeed, when the width of the hole is reduced, its shape is nearly similar to the one of a slot. Then, the optimization is accomplished for... 

This study detects the defect of the void and the exfoliation in the solid phase diffusion bonding interface of ductile cast iron and stainless steel with a nickel insert metal using ultrrasonic testing method, and examine the influence of mutual interference of the reflectional wave both the defect and the interface. 

The reactions of aqueous solutions of nickel(II) salts with hydroxide ions, with excess ammonia, with sulphide ion and with dimethyl-glyoxime (see above) all provide useful tests for nickel(II) ions. 

Evidence of the organic nature of the substance may, be provided by the behaviour of the compound when heated on porcelain or platinum or other comparatively inert metal (e.g., nickel) the substance is inflammable, burns with a more or less smoky flame, chars and leaves a black residue consisting largely of carbon (compare Ignition Test above). 

Alternatively, add 1 or 2 drops of 5 per cent, nickel nitrate solution to 2-3 ml. of the fusion solution, filter off the nickel cyanide and/or nickel sulphide, acidify the filtrate with 2N nitric acid, and test for hahdes as above. 

Process variables also play a significant part in determination of surface finish. For example, the higher the current density, generally the smoother the finish on the workpiece surface. Tests using nickel machined in HCl solution show that the surface finish improves from an etched to a poHshed appearance when the current density is increased from ca 8 to 19 A/cm and the flow velocity is held constant. A similar effect is achieved when the electrolyte velocity is increased. Bright smooth finishes are obtained over the main machining zone using both NaCl and NaNO electrolyte solutions and current densities of 45-75 A/cm. ... 

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