Diamond Innovations. Inc.

Stephen Lee Dole

Thomas R Anthony

Steven William Webb

James McHale

Suresh Shankarappa Vagarali

Robert C DeVries

John William Lucek

Raja Kountanya

Rajeev Tirumala Pakalapati

Biju Varghese

Dwight Dyer

Alan Cameron Smith

John Kieran Casey

Malik Abds-Sami

Robert Dean Scurlock

Abs-Sami Malik

A sintered cubic boron nitride (cBN) compact for use in a tool is obtained by sintering a mixture of (i) cubic boron nitride, (ii) aluminum oxide, (iii) one or more refractory metal compounds, and (iv) aluminum and/or one or more non-oxide aluminum compounds. The sintered bodies may have sufficient strength and toughness to be used as a tool material in solid, i.e. not carbide supported, form, and may be useful in heavy machining of cast irons.

Sintered compact

Composite materials composed of cubic boron nitride (cBN) and a matrix component of various ceramic oxides, nitrides, and solid solutions of matrix materials as well as whisker reinforcements. Methods of manufacture and their use in high performance machining of ferrous metals are also claimed and disclosed.

Cubic boron nitride ceramic composites and methods of making thereof

The invention generally relates to a sintered CBN composite compact having a non-CBN portion. The compact includes about 86 to about 90% CBN and the non CBN portion contains borides and nitrides of Al. The compact is for use as a cutting tool insert in continuous machining of gray cast iron. The sintered compact has a thermal conductivity of 1.25-4 W/cm/&#xb0; K. in the temperature range of about 200&#xb0; C. to about 600&#xb0; C. and sonic velocity of at least about 14.5 Km/sec at room temperature.

Method of solid PCBN sythesis

A jadeite material has a thickness in excess of about 1.0 mm and CIELAB indices of L*&#x3e;42, a*&#x3c;&#x2212;6, and b*&#x3e;+6. The grain size of the jadeite material is less than about 30 microns and is an equiaxed grain structure. The jadeite material has an optical transmission peak between 500 and 565 nm with an I/Ioptical transmission ratio of over 40%. The first step in making the jadeite material is to wrap a glass block, convertible by HP/HT into jadeite and having a nominal composition of NaAlSiO, with a graphite or refractive metal sheet. The wrapped glass block is placed in an HP/HT apparatus, rapidly heated, and subjected therein to a pressure in excess of about 3 GPa and a temperature in excess of about 1000&#xb0; C. for a time adequate to convert the glass block into jadeite. The jadeite material then is cooled and the pressure subsequently released.

Jadeite and its production

A sintered cubic boron nitride (cBN) compact for use in a tool is composed of between about 60 and 80 vol-% cBN having a volumetric mean particle size of between about 3 to 6 &mgr;m and between about 40 and 20 vol-% of a ceramic binder phase. The ceramic binder is composed of between about 20 and 60 vol-% of one or more of a carbide, nitride, or boride of a Group IVB or VIB metal, and between about 40 and 80 vol-% of one or more of carbides, nitrides, borides, or oxides of aluminum. The cBN compact additionally contains between about 3 and 15 wt-% tungsten. The cBN compacts are especially useful in machining iron and like chemically reactive parts, especially where such parts are powder metal parts.

Sintered compact for use in machining chemically reactive materials

Growing community of inventors

Westerville, OH, United States of America

Stephen Lee Dole