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Radio-frequency plasma nitriding and nitrogen plasma immersion ion implantation of Ti-6Al-4V alloy

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SURF N ion implantation improves wear resistance of Ti-6Al-4V alloys by forming hard titanium nitride passivation layer. However, layer thickness formed by traditional ion implantation is 100-200 nm and may not be adequate for industrial applications. It is proposed to use RF plasma nitriding and N plasma immersion ion implantation (PIII) to increase layer thickness. By using newly designed inductively coupled RF plasma source and applying series of negative high voltage pulses to Ti-6Al-4V samples, RF plasma nitriding and N PIII can be achieved. Process yields substantially thicker modified layer exhibiting superior wear resistance. Performance of inductively coupled RF plasma source is described.

Radio-frequency reactively sputtered VO(x) thin films deposited at different oxygen flows

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JES

Radio-opaque coating for biomedical devices.

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A medical device has a radio-opaque coating that can withstand the high strains inherent in the use of such devices without delamination. A coating of tantalum is applied to a medical device, such as a stent, by vapor deposition so that the thermomechanical properties of the stent are not adversely affected.

Radio-opaque paints for medical stents

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Water-soluble radio-opaque paint for coating or marking medical stents is produced by preparing soln of polar solvent, liquid adhesion thickener, preservative, food grade acidulant and dispersion stabilizer; adding radio-opaque powder; and sonifying with ultrasound.

Radioactive decontamination of metal surfaces by electropolishing

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Decontamination of metal surfaces, including removal of radioactive species by surface polishing is described. Method permits removal of ground in, imbedded or otherwise difficult to remove contamination as well as radionuclides such as Pu, U, Ra, Co, Sr, Cs and Am. Details are given of immersion systems, especially those using H3PO4 and of techniques used in field with pumped electrolytes. Examples are given of use for decontamination of large water supply relief valve at Hanford-N-reactor, stainless steel and animal cages, manipulator tong assemblies, fission products storage capsules (removing Sr fluoride contamination from Hastelloy Alloy C-276); tools from radiation-safe glove box, analytical instruments, and a travelling wire flux monitor. Prepolishing aids in efficiency of other cleaning methods. Qualitative and quantitative data are given, and long list of components decontaminated by surface polishing is given.

Radioactive isotope dilution method for analysis of sulphate in chromium plating baths

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Title method is detailed, results being compared with gravimetric method. The latter gave consistently higher results, owing to co-precipitation effects. 7 refs

Radioactivity measurements on vitreous enamel products

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A wide range of vitreous enamelled products was tested for radioactivity. In no cases were levels found to be above specified limits. Such radioactivity as was detected was ascribed to naturally occurring nucleides of thorium & uranium.

Radiochemical studies of thiourea in the electroless deposition process.

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JES Thiourea-C*14 and thiourea-S*35 have been used to study the inclusion of thiourea or its fragments in the electroless nickel deposit. The rate of inclusion in the deposit of S*35 derived from thiourea was determined as a function of deposition rate, deposit thickness, and other parameters. Radiochemical techniques were utilized to determine the existence of breakdown products in the solution. A mechanism of addition agent action which is consistent with these and other data is suggested.

Radiochemical Study of Cathodic Codeposition of Ruthenium in an Alloy with Nickel.

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The electrochem. characteristics of a Ni-Ru alloy electrodeposited from an electrolyte contg. SO42- 1 g-equiv/l., Cl- 1 g-equiv/l., H3BO3 30 g/l, Ni2+ 0.07 mole/l. and Ru in the concn. range 1.3 times. 10-9 - 1 times, 10-5 mole/l, at pH 2.1 proved that this cathodic reaction proceeded in accordance with the basic equation of the theory of joint discharge of ions at limiting current: ARu = KCRu/(I)P where ARu means the Ru concn. in the electrodeposited alloy, K is the const. of the admixt. ion diffuse convection (here 107), CRu is the Ru conc. in the electrolyte (mole/l), I is the cathode c.d. (mA/cm2) and p is the exponent, in this case = 3. As radioactive indicator Ru-106 was used. By study of Ru electrodeposition from the above electrolytes without Ni it was detd. that the amt. of Ru deposited did not depend on the c.d. in the range 32-158 A/m2, and that Ru current efficiency was proportional to the Ru concn. in electrolyte and inverse by proportional to less the c.d. In codeposition with Ni, the amt. of Ru in the alloy increased with the Ru concn. in electrolyte and decreased with an increase in c.d. The presence of Ru in the Ni alloy decreased the H overvoltage, which caused a decrease in the Ni current efficiency, which in the alloy studied contg. the max. Ru content of 1.5% was only 2-6%.

Radiochemical study of codeposition of ruthenium nickel alloys

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Radiographic Inspection of Multilayer Printed Circuit Boards

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Radiographic NDT Quality Control

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The merits of radiographic, film-based NDT are extolled.Same issue has several articles on AOI (Automated Optical Inspection).

Radioisotopes Speed Measurement of Precious Metal Plating Thickness

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The beta backscatter method is explained and demonstrated, mainly with reference to Au. Comparisons with optical microsectioning are made. 1 ref.

Radioisotopic Investigation of the Codeposition of Iron, Cobalt, and Nickel in Gold Electrodeposits on Electronic Equipment.

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The effect of contamination of a cyanide, phosphate-buffered Au plating bath with Fe, Co, or Ni on the codeposition of these metals with Au, was investigated using 59Fe, 58Co, and 64Ni. The Co and Ni were virtually not codeposited in Au if present in the soln. in amts. to 1000 or 2000 mg/dm3, resp. The Fe deposited in large amts. (up to 18%) depending on its concn. and the cathode c.d. The diminishing in current efficiency of the plating process is proposed as an early signal of the contamination of Au deposit with Fe.

Radioisotopic Study of Cadmium Electrodeposition on Lead in Sulphuric Acid Solutions

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Radio-labelled Cd (109) was electrodep'n onto Pb. Cyclic voltammetry was used to study the underpotential deposition (UPD) effects. SEM micrographs of surface structure are presented. 10 refs.