Iowa State University Research Foundation Inc

Other

Mufit Akinc

Andrew J Thom

Liang-tseng Fan

Mitchell K Meyer

Clarence E Hulbert, Jr

Yuksel Sarikaya

Ahmet Celikkaya

A boron-modified molybdenum silicide material having the composition comprising about 80 to about 90 weight % Mo, about 10 to about 20 weight % Si, and about 0.1 to about 2 weight % B and a multiphase microstructure including Mo.sub.5 Si.sub.3 phase as at least one microstructural component effective to impart good high temperature creep resistance. The boron-modified molybdenum silicide material is fabricated into such products as electrical components, such as resistors and interconnects, that exhibit oxidation resistance to withstand high temperatures in service in air as a result of electrical power dissipation, electrical resistance heating elements that can withstand high temperatures in service in air and other oxygen-bearing atmospheres and can span greater distances than MoSi.sub.2 heating elements due to improved creep resistance, and high temperature structural members and other fabricated components that can withstand high temperatures in service in air or other oxygen-bearing atmospheres while retaining creep resistance associated with Mo.sub.5 Si.sub.3 for structural integrity.

Boron modified molybdenum silicide and products

A titanium silicide material based on Ti.sub.5 Si.sub.3 intermetallic compound exhibits substantially improved oxidative stability at elevated temperatures. In particular, carbon is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.6 weight % C) effective to impart substantially improved oxidative stability at elevated temperatures, such as about 1000.degree. C. Boron is added to a Ti.sub.5 Si.sub.3 base material in an amount (e.g. about 0.3 to about 3.3 weight % B) to this same end.

Carbon or boron modified titanium silicide

A thermoporosimeter for accurately and inexpensively determining porosity characteristics of material. The material is saturated with a liquid and then placed within an enclosed area and in communication with a mass measuring unit. A furnace with a furnace control provides increasing heat to the material within the enclosed area. As the liquid saturated in the pores of the material evaporates, the mass of the material changes and is recorded by the mass measuring unit. The mass measuring unit communicates the values for mass change through an interface to a microcomputer. A temperature sensor located within the enclosed area also provides temperature values to the computer through an interface. By measuring the change in mass as a function of temperature, it is possible to determine porosity characteristics of the material, which include but are not limited to, pore size, pore volume, and pore size distribution of the material.

Thermoporosimeter

A process of forming superconductor ceramic oxides from a melt of barium hydroxide and a copper salt selected from copper nitrate and copper acetate.

Method for preparing superconductors ceramic composition

In a method of making concrete of the Portland Cement type wherein a quantity of cementitious material, such as Portland Cement, is mixed with a quantity of aggregate, generally sand and rock in varying proportions and water; and, wherein, the resulting mixture is stirred or mixed for an appropriate length of time consistent with acceptable practices in the concrete industry after which the mix is poured and allowed to set, the improvement which is characterized by the employment of fly ash as the major ingredient in the cementitious material. The improvement also includes the adding of gypsum to the initial mix in an amount equal to about 2% by weight of the fly ash and, thereafter, adding in and mixing a quantity of calcium chloride equal to about 3% by weight of the fly ash. As an added feature, a quantity of organic material, such as a latex emulsion, can be added to the initial mix to improve the flow characteristics of the concrete mix and to improve the physical characteristics of the ultimate concrete.

Growing community of inventors

Ames, IA, United States of America

Mufit Akinc