Certainteed Corporation

Saint-Gobain Ceramics & Plastics, Inc.

Walter T Stephens

Tihana Fuss

Ming Liang Shiao

Kevin R Dickson

Husnu M Kalkanoglu

Keith C Hong

Tihana Tresler

Laurie San-Miguel

Thomas Szymanski

Pushkala Krishnamurthy

Danny Louis Mickelson

Ian Jaeger

Ying Cong Jiang

Suchira Sen

Fang Wei

Danny Louis Michelson

Erick J Acosta

A process for preparing roofing granules includes forming kaolin clay into green granules and sintering the green granules at a temperature of at least 900 degrees Celsius to cure the green granules until the crystalline content of the sintered granules is at least ten percent as determined by x-ray diffraction.

Solar heat-reflective roofing granules, solar heat-reflective shingles and process for producing the same

Solar reflective roofing granules include a binder and inert mineral particles, with solar reflective particles dispersed in the binder. An agglomeration process preferentially disposes the solar reflective particles at a desired depth within or beneath the surface of the granules.

Roofing granules with high solar reflectance, roofing products with high solar reflectance, and processes for preparing same

Roofing granules with high solar reflectance, roofing products with high solar reflectance, and processes for producing same

A proppant for use in fracturing geological formations is made from bauxitic ores and a calcium containing compound. The proppant has a calcium containing crystalline phase.

Ceramic particles and process for making the same

Disclosed is a population of ceramic particles that includes a plurality of individual, free flowing particles. The plurality has a total weight and particle size distribution. The effective width of the distribution is the difference between the distribution's dand dparticle sizes. The distribution's effective width exceeds 100 microns and includes three abutting and non-overlapping regions that include a first region, a second region, and a third region. The first region abuts the second region and the second region abuts the third region. The width of the second region is at least 25% of the effective width. The weight of particles in the second region does not exceed 15% of the plurality of particle's total weight. The weight of particles in the first region and the third region each exceed the weight of particles in the second region. Methods of making the populations of ceramic particles are also disclosed.

Ceramic particles and methods for making the same

Disclosed is a process for producing ceramic particles, such as proppants, that have at least 10 percent total porosity. The process includes forming a particle precursor that includes 5 percent to 30 percent of a first ceramic material and at least 40 percent of a second ceramic material. The sintering temperature of the first ceramic material may be lower than the sintering temperature of a second ceramic material. Heating the precursor to a maximum temperature above the sintering temperature of the first material and below the sintering temperature of the second material. Also disclosed is a ceramic article that has a particular combination of chemistry and alumina crystalline phase.

Ceramic particle comprising an alumina crystalline phase

Solar heat-reflective roofing granules, solar heat-reflective shingles, and process for producing the same

A sintered ceramic particle made from a ceramic material having a true density greater than 3.5 g/cc and a composition having no more than 30 weight percent silicon oxide and at least 15 weight percent iron oxide, based on the combined weight of the oxides of aluminum, iron and silicon, is disclosed. A process that utilizes an externally applied compressive force to make a ceramic particle is also disclosed.

High strength proppants

One embodiment of the present invention relates to spherical ceramic elements, such as proppants, for maintaining permeability in subterranean formations to facilitate extraction of oil and gas therefrom. The strength of the ceramic element may be enhanced by combining materials having different coefficients of thermal expansion. Methods of making the ceramic elements are also disclosed.

High strength ceramic elements and methods for making and using the same

Growing community of inventors

Cleveland, OH, United States of America

Walter T Stephens