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An Investigation Of The Characteristics Of High Alumina Refractory Castables, Gajendra Nath Mohanty

Doctoral Dissertations

"Refractory castables or concretes, a comparatively new member of the refractories family, are an admixture of highly aluminous cements and graded refractory aggregates, blended in predetermined proportions very much like structural concrete. The refractory aggregates must contain a large amount of fines contrary to the requirements of ordinary concrete. Unlike the Portland cements, which are mainly combinations of calcium silicates, the highly aluminous cements are predominantly calcium aluminates. They are comparatively of a refractory natures, having the hydraulic setting property combined also with high early strength. The discovery of the fact that these refractory concretes could be cast, in situ, …

A Fundamental Study Of Clay Drying Using Ware Of Large Cross Section, Robert F. Grady Iii

Masters Theses

"The drying of clay has been studied extensively in the past by many investigators, some of whom attempted to relate this information to the structure of clay and thereby develop a more vivid picture, while others studied the mechanism of drying in its own right in order to present a useable theory that would allow improvements in the drying operation.

At present the literature is unable to present a theory of the mechanism of drying that is sufficiently general to cover the observed aspects of clay drying. Many and varied mechanisms are presented, but correlation is seldom completely evident between …

Testing Of Missouri Shales For Light Weight Aggregate Production, Jerry D. Plunkett

Masters Theses

"The original objective of this investigation was to determine by testing those clays, shales, and loesses occuring in Missouri in large deposits (over 15 feet in thickness with little overburden), which would be suitable for the production of light weight aggregate. The second objective was to investigate the mechanism of bloating as related to the physical and chemical properties of the above materials, and by using these relationships cause clays which do not naturally bloat, to bloat using some addition. The use of additives would permit the economical use of material closer to the market in many instances.

After the …

A Study Of The Deformation Texture And Its Variation In Cold Drawn Nickel Rods, Krishan Kumar Tangri

Doctoral Dissertations

"The production of rods by cold drawing is a development of recent years as compared to other methods of fabrication. Though a good many investigations correlating the observed mechanical properties to the mill practices employed have been reported, the results nevertheless are more of a qualitative and empirical nature. It is well known that the physical properties of a metal product are related to its deformation textures which are characteristic of the metal and the fabricating method used. Thus a study of the deformation textures of cold-drawn rods, specially by x-ray diffraction techniques should provide a much more precise and …

Hydrogen Overvoltage On Titanium, Sheng-Tai Shih

Doctoral Dissertations

"The hydrogen overvoltage has been defined as the difference between the potential of the working electrode (cathode) and the theoretical reversible value for the same solution. This definition brings out the difficulty involved in the measurement of the "theoretical reversible potential for the same solution” as the potential of the hydrogen electrode in such a solution is usually different from the value of a standard reversible hydrogen electrode, for which the activity of hydrogen ions is set as being “1” and the potential arbitrarily set as being “0”. Besides, it is sometimes necessary to add addition agents to the solution …

Mechanism And Measurement Of First Stage Graphitization In White Cast Iron, David S. Gould

Masters Theses

"The original object of this thesis was to ascertain if coercive force measurements could be used for the determination of degree of malleablization in malleable iron. Since first stage graphitization was involved, it was only natural that an interest in the mechanism of first stage graphitization developed. The investigation which resulted from this interest was done primarily for the edification of the author, however it was subsequently deemed of enough importance to be included in this thesis. For this reason the thesis may appear at times to deviate from the original objective"--Preface, page iii.

A Study Of The Bonding By Air-Setting Refractory Mortar At Elevated Temperatures, Bhikhubhai Mahadeo Sedalia

Doctoral Dissertations

"The importance of a suitable material for the laying of bricks in furnace and kiln construction has been recognized by the refractory industry for a long time. It is necessary that a strong bond should develop between the bricks to impart strength to the entire construction work. A weak joint would form the weakest link and dangerously weaken the whole structure.

Such being the importance of the bond, the refractory industry has made quite an effort to develop jointing materials which would produce strong bonds. During the last two decades, due to intensive research and development work, many good bonding …

Carbon Monoxide Attack Of Refractories, William A. Frad

Doctoral Dissertations

"The disintegration and failure of fire clay refractories due to the action of carbon monoxide has been studied tor a period at about fifty years. The most important application is in blast furnace refractories. Similar failures due to carbon deposition, involving other gases such as methane, have been noted and less extensively studied. Failures due to the action of gases other than carbon monoxide are beyond the scope of this thesis. Occasional attempts to find some agent to prevent disintegration have been mentioned in the literature. In this study the number of such substances and the results of their action …

The Rate Of Dissolution Of Aluminum In Hydrofluoric Acid, Yen-Ngen Wang

Doctoral Dissertations

"Pure aluminum has a relatively low strength, and its use is, therefore, rather limited. However, the resistance of pure aluminum to the attack of acids and many neutral solutions is higher than that of less pure aluminum or most of the aluminum-base alloys. For this reason, alclad alloy sheets, are made with a coating of pure aluminum on one or both sides of an aluminum alloy core. The coating is metallurgically bonded to the core over the entire area of contact. Thus the coating electrochemically protects the core from corrosive attack.

Aluminum is more negative in the electrochemical series than …

Effect Of Carbon Content In Steels Upon The Deposition Of Titanium From A Fused Salt Bath, Reinhard Paul Abendroth

Masters Theses

"STATEMENT OF PROBLEM Previous work done at the Missouri School of Mines and Metallurgy on the deposition of titanium upon various metals, especially iron and steel, bas shown that titanium can be deposited upon ingot iron and. low carbon steels with comparitive ease. Difficulty was encountered in attempts to deposit titanium upon steels of higher carbon content and upon cast irons.

For this reason, it was decided to investigate more thoroughly the relationship between the carbon content of various steels and the quality of titanium coatings deposited on these steels. Once this relationship had been established, a suitable theoretical explanation …

Deposition Of Metallic Coatings From Fused Salt Baths, Andrew Hessler Larson

Masters Theses

"This thesis is the result of an investigation undertaken to study some of the important factors affecting the deposition of metallic diffusion coatings on other metals immersed in a fused salt bath….

There are many methods which have been devised to obtain diffusion coatings on various metals. One which is quite well known and used commercially is the process of “chromizing” which produces a diffusion layer if chromium on another metal. One method of “chromizing” consists of immersing the specimen to be coated in a mixed chloride fused bath containing chromium metal flakes. Another method consists of packing a low …

Corrosion Products Of Titanium In Fused Salt Baths, Kai-Chai Chiou

Masters Theses

"Titanium is gaining great interest in the modern metal industry because of its natural abundance and its desirable physical and chemical properties. Among them, its excellent corrosion resistance, such as the resistance to normal atmosphere attack, humid and saline atmosphere attack, sea water attack, and nitric acid attack, is the most prominent characteristic being welcomed by the engineers. The usefulness of titanium would be greatly increased if it were possible to plate titanium on other metals, thus increasing the corrosion resistance of these other metals.

Much concern, at present, has been given to the possibilities of the electrodeposition of titanium …

The Application Of Electric Energy To The Metallurgy Plants In Montana, Edwin J. Duncan

Bachelors Theses and Reports, 1928 - 1970

Since the year 1800, metallurgy has been affiliated with electricity. In fact, the two industries have grown side by side, being naturally dependent upon each other and having a parallel growth.

The Construction And Operation Of A Universal Specimen Mount With Protective Lead Shield For The Purpose Of Determining Pole Figures Using The Schulz-Decker Transmission Technique, Richard L. Fausner

Bachelors Theses and Reports, 1928 - 1970

It was the purpose of this study to construct a universal mount, to construct a protective lead shield, to operate the instrument, and to provide a pole figure using the transmission method of Schulz and Decker. There are at present several lengthy x-ray methods of determining the grain orientation of metals. These methods are mainly photographic. In order to provide a rapid means of obtaining the necessary information concerning the grain orientation of a metal, a universal mount was constructed.

The Lucky Hit Mine Of Jefferson County, Montana, Bruce B. Goddard

Bachelors Theses and Reports, 1928 - 1970

Many mines in the Cardwell Mining District have been more or less steady producers of gold, silver, lead and zinc since 18SO. The area first came into prominence with the discovery of gold at the Mayflower Mine in 1896. Soon after the Mayflower discovery, many claims were located in the nearby Saint Paul Gulch area, northeast of Whitehall. The Lucky Hit Mine is located in Saint Paul Gulch area of the Cardwell Mining District.

Nonmetallic Mineral Resources Of Montana (Except Fuels), F. L. Rytlewski

Bachelors Theses and Reports, 1928 - 1970

Essentially, the paper is composed of seven parts, each of which concerns a group of related nonmetallic minerals such as ceramic materials, gemstones, or abra­sives. Following the data pertaining to the minerals of each group are index mars locating the major mineral deposits which are known to date. Production and reserve figures are listed by tables in cases where such information is available.

The Flotation Concentration Of A Complex Low-Grade Lead Zinc Ore, Edward James Fong

Bachelors Theses and Reports, 1928 - 1970

This report is concerned primarily with the beneficiation of a low-grade complex lead-zinc ore. The depletion of high grade veins has caused the mineral engineer to seek deposits deeper in the earth's crust or to find lower grade deposits. The other alternative has placed more research problems on Mineral Dressing Engineers in particularly the iron, copper, lead and zinc fields.

Host Rocks And Gangue Minerals Associated With Copper Deposits In Plutonic Igneous Rocks, Richard D. Montgomery

Bachelors Theses and Reports, 1928 - 1970

All of the information on the various districts has come directly from published reports. The investigation was suggested by Mr. Forbes Robertson. The geographical extent of the deposits was confined to the western United States. Many of these deposits are of the disseminated porphyry type. A few of the de­posits, such as at Butte, Montana, were of the fissure vein type.

Geology Of The Marget Ann Mine Butte District, Montana, Winston Martin Sahinen

Bachelors Theses and Reports, 1928 - 1970

As the field work progressed it became apparent that very little was known of the mineralogical associations of the precious metal constituents of the Marget Ann ore. A mineralogical study in excess of that originally planned was then decided upon to de­termine the affiliations exhibited by the silver and gold. With these objectives in mind, the laboratory and field work continued.

Studies Of Tempering Behavior Of Steel X-9165 Of N-A-X 9100 Series, James A. Ndulue

Bachelors Theses and Reports, 1928 - 1970

One of the reasons why steel is the most versatile of all the metals available for engineering applications is because of the wide range of properties that can be obtained from it by proper heat treatment.

The Orientation Of Quartz Grains In Unconsolidated Beach Sands Of San Luis Obispo County, California, David V. Pearson

Bachelors Theses and Reports, 1928 - 1970

The purpose of this investigation is to determine the orientation of quartz grains in unconsolidated beach sands, and if possible, to determine some of the physical factors involved in producing the orientation found.

Polarographic Determination Of Germanium, Calvin Leo Stevenson

Bachelors Theses and Reports, 1928 - 1970

In the past germanium has been determined by either wet methods or by the spectograph; the spectograph being used for the determination of very small amounts of ger­manium and wet methods used when more than one hundredth of one percent germanium is present. Both of these analyti­cal schemes have weaknesses.

Fluorite Deposits In The Dry Creek District, Near Superior, Mineral County, Montana, Russell M. Corn

Bachelors Theses and Reports, 1928 - 1970

Fluorite was discovered in the. Dry Creek District, Mineral County, in 1943 and the first commercial prod­uction of this mineral in Montana waS recorded from this locality.

Concentration Of Tungsten Ore From The Potosi Mining District, Ted S. Jordan

Bachelors Theses and Reports, 1928 - 1970

Tungsten is a strategic metal which, at present, is in short supply in the United States. In addition to its need in the defense effort, tungsten is becoming more and more in industrial demand and, as an increasing number of uses for this element are being found, so must additional sources of it be discovered and processed.

The Decomposition Of Calcium Tungstate And Synthetic Scheelite With Hydrochloric Acid, Robert R. Beebe

Bachelors Theses and Reports, 1928 - 1970

The decomposition of scheelite with hydrochloric acid was studied under conditions of variable acid concentration, time and temperature. The reactions were traced by weigh­ing material untransformed and, in some cases, by analyzing the transformation products.

The Indium-Mercury Constitutional Diagram, Bert E. Lake

Bachelors Theses and Reports, 1928 - 1970

Whenever metals differ greatly in electropositivity, intermetallic compounds are likely to form in preference to solid solutions. 21ercury and indium show a considerable difference in electropositivity. This would indicate that intermetallic compounds may play an important role in the con­stitutional diagram for the mercury-indium system.

The Effect Of Germanium On The Current Efficiency In The Electrolysis Of Pure Zinc Sulfate Solution, Keith R. Bock

Bachelors Theses and Reports, 1928 - 1970

It has long been recognized that electrolytic zinc cells are extremely sensitive to impurities. In fact, cer­tain impurities present in amounts as low as 0.1 mg/1 cause a serious loss of current efficiency. Also, the presence of several impurities in the electrolyte may accelerate the detrimental effect of each impurity.

Metal Dust Production, James H. Foreman

Bachelors Theses and Reports, 1928 - 1970

The object of this thesis is to study the production of metal dust by direct application of a mechanical force to a stream of molten metal.

Recrystallization Of High Purity Aluminum, Virgil H. Griswold Jr.

Bachelors Theses and Reports, 1928 - 1970

If a metal is first cold-worked and then heated to a sufficient temperature for an adequate length of time, the hardening properties due to cold-working disappear, and the metal will return more or less to its original state. Upon examination of the microstructure, we find that new grains have replaced the old grains through what is called recrystallization. The final size of the recrystallized grains depends upon three important variables--the degree of cold-work or deforma­tion, annealing temperature, and annealing time.

A Study Of The Effects Of The Chloride Ion On The Lead-Silver Anodes And On The Lead Tenor Of The Zinc Deposit In Zinc Electrolysis, William A. Mitchell

Bachelors Theses and Reports, 1928 - 1970

The electrolyte used in the commercial production of electrolytic zinc from zinc sulphate solutions contains small amounts of impurities each of which has its own effects upon the process. Impurities such as antimony, cobalt, nickel, and iron tend to lower the current efficiency while other impurities such as chlorine, fluorine, and nitrates tend to increase the corrosion of the lead anodes and thereby increase the lead tenor of the zinc deposit.