Taegutec, Ltd.

Sung Su Chun

Dae Yeop Lee

Chang Hoon Hong

Geun Ho Park

Kwon Hee Park

Sang Woong Na

A SiAlON composite includes a SiAlON phase including &#x3b1;-SiAlON phase, &#x3b2;-SiAlON phase and grain boundary phase. The SiAlON composite is prepared from a starting powder mixture including a silicon nitride powder and at least one powder providing aluminum, oxygen, nitrogen, yttrium (Y) and erbium (Er) to the SiAlON composite. The SiAlON composite contains the SiAlON phase of at least 90 vol %, z-value of the &#x3b2;-SiAlON phase ranges between 0.27 and 0.36 and thermal diffusivity of the SiAlON composite is equal to or greater than 2.4 (mm/sec) and equal to or less than 5.2 (mm/sec).

Sialon composite and cutting tools made thereof

A ceramic material includes of &#x3b2;-sialon (SiAlON), polytype 15R, an intergranular phase, and yttrium. The polytype 15R includes twin grains.

Ceramic material and cutting tools made thereof

A cutting tool including a fine and uniform alumina-based substrate is disclosed herein. In an exemplary embodiment, the alumina-based substrate includes 0.1 to 25% by volume of one or more metal oxides, or 5 to 80% by volume of metal carbonitride and 0.01 to 10% by volume of one or more metal oxides. Metal constituting the metal oxide and the metal carbonitride is selected from the group consisting of elements from Groups III to VI (including La group and Ac group) of the periodic table, Mg and Co. The metal oxides added to alumina reside at the boundaries of alumina grains, thereby prohibiting the alumina grains from growing excessively during a sintering process.

Growing community of inventors

Daegu, South Korea

Sung Su Chun