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Articles 1 - 17 of 17
Full-Text Articles in Engineering
Crystal Habit Modification Of Sodium Chlorate, Michael R. Keegan
Crystal Habit Modification Of Sodium Chlorate, Michael R. Keegan
Bachelors Theses and Reports, 1928 - 1970
All single crystals have a particular habit or morphology. The crystal habit refers to the relative degree of development of crystallographic planes into surfaces which make up the external appearance of the single crystal.
In this paper, NaClO3 is used as a parent crystal. Its simple cubic habit is modified to tetrahedral by the use of impurities of SO4=, S2O3=, Cr2O7=, and NO3-. The degree of habit change is studied as a function of impurity concentration and temperature. The problem and phenomena are explained in terms of surface chemistry and thermodynamics.
Physico-Chemical Principles Of Sixteenth Century Metallurgy, Robert E. Johnson
Physico-Chemical Principles Of Sixteenth Century Metallurgy, Robert E. Johnson
Bachelors Theses and Reports, 1928 - 1970
Following a review of sixteenth century metallurgical literature and a discussion of Gibbs free energy, this thesis discusses thermodynamic considerations of galena (PbS) reduction by iron from a lead assay of this period. The importance of fluxes in this assay is emphasized. The discussion covers both equilibrium and non-equilibrium conditions at 1100 degrees Celsius. Possible substitutes for iron are also covered.
Information from twenty-one small controlled lead assays is correlated with the thermodynamic discussion to determine the purpose of each constituent in the assay.
The Beneficiation Of Titaniferous-Magnetite Sands, Ronald Lloyd Nordwick
The Beneficiation Of Titaniferous-Magnetite Sands, Ronald Lloyd Nordwick
Bachelors Theses and Reports, 1928 - 1970
The purpose of this investigation of beneficiation methods is to develop and study possible economic methods for recovering an iron-titanium concentrate of sufficient purity to meet metallurgical requirements for subsequent direct reduction to pig iron and a high titanium slag.
Stress-Corrosion Cracking Of Brass, Paul A. Fossey
Stress-Corrosion Cracking Of Brass, Paul A. Fossey
Bachelors Theses and Reports, 1928 - 1970
the mechanism of stress-corrosion cracking of brass has been sought for many years. Investigators have proposed many mechanisms, but each of these mechanisms has always had several drawbacks. This paper presents an account of experimental work done in the laboratory on this subject and compares it to the work of previous investigations. It evaluates the mechanisms presented by investigators and shows the failures of these mechanisms. A theory of Nitrogen Embrittlement is presented and an evaluation of this theory with experimental work follows.
Experimental Arc Furnace Smelting Of Titaniferous Iron Sands From The Northern Oregon Coast, Allan P. Herring
Experimental Arc Furnace Smelting Of Titaniferous Iron Sands From The Northern Oregon Coast, Allan P. Herring
Bachelors Theses and Reports, 1928 - 1970
This investigation is an attempt to experimentally smelt titaniferous iron sands from the Northern Oregon Coast in a laboratory arc furnace.
The Effect Of Ph Upon Chelation Reactions In Montmorillonite Clays, Joseph Michael Keane
The Effect Of Ph Upon Chelation Reactions In Montmorillonite Clays, Joseph Michael Keane
Bachelors Theses and Reports, 1928 - 1970
The purpose of this thesis is to investigate several chelation reactions and determine the effect of variable pH upon these reactions.
An Investigation Of The Sintering Of Iron-Wire Compacts, George L. Vivian
An Investigation Of The Sintering Of Iron-Wire Compacts, George L. Vivian
Bachelors Theses and Reports, 1928 - 1970
A study of the sintering of iron has been made by observing the rate of bonding of iron wires wound on iron spools. The specimens were sintered at a constant temperature of 850c in vacuum furnaces capable of producing pressures of 10-5 to 10-4 mm of mercury, and the growth of the bond between wires was observed as a function of time.
It has been concluded that the volume-diffusion mechanism is strongly operating in the sintering of iron at 850c, but in an evacuated system, the evaporation-condensation mechanism also contributes to the sintering process.
A Survey Of The Influence Of Selected Sulfides On The Thermal Decomposition Rate Of Zinc Sulfate, L. G. Twidwell
A Survey Of The Influence Of Selected Sulfides On The Thermal Decomposition Rate Of Zinc Sulfate, L. G. Twidwell
Masters Theses
"The influence which ZnS, CdS, Cu2S, PbS, and FeS has on the thermal decomposition rate of ZnSO4 was studied by measuring the SO2 gas evolved per unit of time for various ZnSO4-MeS mixtures at 600°C, and analyzing the solid phases by means of X-ray diffraction patterns.
The SO2 gas evolved upon heating the pellets was analyzed as a function of time by absorbing the gas in a solution of distilled water, H2O2, and NaOH, and measuring the time required for the SO2 to neutralize the NaOH. The gas …
A Study Of Segregation In Cast Aluminum-Uranium Alloys, B. L. Bramfitt
A Study Of Segregation In Cast Aluminum-Uranium Alloys, B. L. Bramfitt
Masters Theses
"This investigation involves a photomicrographic study of the segregation resulting from the eutectic solidification characteristics of aluminum-uranium alloys, ranging from 5 to 30 weight percent uranium. The segregation can occur in either of two manners; the first, due to the gravitational forces acting upon the growing particles which nucleate in the melt and the second, due to the mode and rate of heat transfer through the material. It was found that segregation occurred only as the result of the latter factor due to the small volume of the ingot and the rapid rate of heat transfer. The segregation was measured …
A Study Of The Chemical Kinetics, Activation Energy And Difference Effect On Beryllium Dissolving In Mineral Acids, Daniel Santhamurthi Gnanamuthu
A Study Of The Chemical Kinetics, Activation Energy And Difference Effect On Beryllium Dissolving In Mineral Acids, Daniel Santhamurthi Gnanamuthu
Masters Theses
"The rate of dissolution of polycrystalline beryllium was studied in hydrofluoric, hydrochloric and sulfuric acids. Two samples of beryllium containing different amounts of beryllium oxide were used. The experiments were performed at temperatures ranging from 20 to 50°C, and at various acid concentrations. The kinetics of these heterogeneous processes conformed to a reaction order of approximately one in all the cases. Since the conditions of the surface were complex during dissolution, these might complicate the reaction. This might be due to the oxide layer, which is present as impurity.
The difference effect was determined at various acid concentrations at 25°C …
A Study Of Several Commercial Steels In The Red Short Range, Jorge Alberto Espana
A Study Of Several Commercial Steels In The Red Short Range, Jorge Alberto Espana
Masters Theses
"The red short phenomenon present in steel, was studied by means of torsion tests at temperatures between 800 and 1200⁰C. Cold drawn bars of different compositions of steels were tested, and the number of turns to failure and maximum twisting torque were plotted versus temperature.
All the steels tested, exhibited to have a certain degree of red shortness. By comparing the curves and the respective chemical analyses, the detrimental effect of sulphur and lead and the beneficial effect of manganese, was established.
Microscopic examinations revealed the intergranular nature of the cracks in the red short range. Sulphur and oxide distribution …
Electrodeposition Of Antimony From Sulfide Melts, Mahendra N. Rana
Electrodeposition Of Antimony From Sulfide Melts, Mahendra N. Rana
Masters Theses
"A study of the current-potential relationships, and the electrodeposition of antimony metal was conducted for fused mixtures of Sb2S3-Na2S, Sb2S3-Sb and Sb2S3-NaCl-KCl in the temperature range of 700° - 900°C. An attempt was made to determine the mutual solubility of molten antimony and Sb2S3-Na2S melts. The microstructure of deposited metal was studied metallographically. Analysis of phases present in the matte mixture (Sb2S3-Na2S) was made by x-ray diffraction patterns.
All investigations were carried out in …
The Effect Of The Rolling Load On The Micro-Structure Of Low Carbon Sheet Steel, Jerry Lee Cadden
The Effect Of The Rolling Load On The Micro-Structure Of Low Carbon Sheet Steel, Jerry Lee Cadden
Masters Theses
"A Stanat 315, two high-four high, combination rolling mill is used to cold roll annealed, low carbon steel strips. A method of measuring the rolling load was presented. The method consisted of constructing a load cell using SR-4 strain gages attached to a steel column. The load cell was placed under the hold down screw of the rolling mill and a known load was applied. The stresses from this load were transferred to the mill housing where another SR-4 strain gage was located. The strain in the mill housing was recorded at the corresponding applied load. During rolling, the strain …
A Weight Loss Technique For The Determination Of Phase Boundaries, Robert Lee Benner
A Weight Loss Technique For The Determination Of Phase Boundaries, Robert Lee Benner
Masters Theses
"An apparatus has been designed and constructed that would continuously record the weight loss of a sample in a flowing inert atmosphere, at a constant temperature.
A technique has been developed to determine the phase boundaries of a binary phase diagram.
Alloys of the magnesium-nickel, cadmium-antimony, copper-cadmium, copper-zinc, and magnesium-zirconium systems were subjected to investigation to verify the operation and resolve a number of limitations of the equipment.
These investigations disclosed that the apparatus gave the best results with alloys having vapor pressures in the range between 1 and 35 millimeters of mercury"--Abstract, page 2.
A Determination Of Vapor Pressure Of Barium In The Thermal Production Of Barium Metal, Thomas A. Theobald
A Determination Of Vapor Pressure Of Barium In The Thermal Production Of Barium Metal, Thomas A. Theobald
Masters Theses
The Knudsen effusion method was used to find the equilibrium reaction pressure of barium for the following reactions:
4BaO + 2Al - 3Ba + BaO·Al2O3 (l)
4BaO + Si - 2Ba + 2BaO·SiO2 (2).
The resulting barium pressure for reaction (l) ranged from 0.27 mm. Hg to 1.77 mm. Hg in a temperature range of 940°C to 1086°C. The barium pressures for reaction (2) varied from 0.38 mm. Hg to 1.94 mm. Hg in a temperature range of 1000°C to 1086°C. The free energies of formation of BaO·Al2O3 and 2BaO·SiO2 at 1087°C …
A Study Of The Recrystallization And Polygonization Of High Purity Aluminum, Robert Leon Wright
A Study Of The Recrystallization And Polygonization Of High Purity Aluminum, Robert Leon Wright
Masters Theses
"Laue back reflection patterns were used along with visual examination in evaluating the characteristics of the annealed structure of high purity (99.99%) aluminum single crystals which had been deformed by elongation. It was found that the glide strain and annealing temperature are primary factors to be considered with respect to the structural changes occurring during annealing.
It was determined that the glide strain must be above a certain critical value to cause recrystallization; below the critical value polygonization will predominate in the annealed structure regardless of the annealing temperature.
The single crystals used in the investigation were grown by the …
An Investigation Of The Deformation Textures Of Cobalt, Roy Carl Wilcox
An Investigation Of The Deformation Textures Of Cobalt, Roy Carl Wilcox
Doctoral Dissertations
"Deformation textures of various cobalt structures as a result of cold rolling together with some annealing textures were studied. The textures of cobalt were determined using a modification of the Schulz-Decker Geiger counter technique. Pole figures of the (1011), (0001) and (1010) planes were constructed. Also, a study of the microhardness of cobalt was made.
Microhardness tests were performed on various cobalt structures, in both the cold rolled and unworked conditions. The microhardness was found to vary with the source of the cobalt, the crystal orientation, and the amount of deformation and twinning. Deformation lines about the hardness impressions diffused …