Sumitomo Electric Hardmetal Corp.

Momoko Iida

Haruyo Fukui

Makoto Setoyama

Kiichi Meguro

Masayuki Nishizawa

A cutting tool comprises a rake face and a flank face, the cutting tool being composed of a substrate made of a cubic boron nitride sintered material and a coating provided on the substrate, the coating including a MAlN layer, when a cross section of the MAlN layer is subjected to an electron backscattering diffraction image analysis to determine a crystal orientation of each of the crystal grains of the MAlN and a color map is created based thereon, then on the color map, the flank face having the MAlN layer occupied in area by 45% to 75% by crystal grains of the MAlN having a (111) plane with a normal thereto extending in a direction within 25 degrees with respect to a direction in which a normal to the flank face extends, the MAlN layer having a residual stress of −2 GPa to −0.1 GPa.

Cutting tool

A method of measuring a concentration of nitrogen in diamond includes a first step, a second step, and a third step. In the first step, diamond is arranged in the inside of an integrating sphere. In the second step, visible light is emitted to the inside of the integrating sphere and the visible light that is reflected by an inner surface of the integrating sphere and passes through or is reflected by diamond arranged in the inside of the integrating sphere is received. In the third step, the concentration of nitrogen in diamond is calculated based on data on received visible light and a mass of diamond.

Method of measuring concentration of nitrogen in diamond and apparatus that measures concentration of nitrogen in diamond

A cutting tool comprises a rake face and a flank face, the cutting tool being composed of a substrate made of a cubic boron nitride sintered material and a coating provided on the substrate, the coating including a MAlN layer, the MAlN layer including crystal grains of MAlN in the cubic crystal system, n&#x3c;nbeing satisfied, where nrepresents a number of voids per 100 &#x3bc;m in length of the MAlN layer on the flank face in a cross section of the MAlN layer, and nrepresents a number of voids per 100 &#x3bc;m in length of the MAlN layer on the rake face in a cross section of the MAlN layer, nbeing 3 or less, where nrepresents a number of droplets per 100 &#x3bc;m in length of the MAlN layer on the flank face in a cross section of the MAlN layer.

Growing community of inventors

Itami, Japan

Momoko Iida