EARTH-BORING PARTICLE - MATRIX ROTARY DRILL BIT AND METHOD OF MAKING THE SAME

文件类型：PDF文档
文件大小：1394K
An earth-boring rotary drill bit includes a bit body configured to carry one or more cutters for engaging a subterranean earth formation. The bit body includes a particle-matrix composite material having a plurality of hard particles dispersed throughout a matrix material, the particle-matrix composite material having a first coefficient of thermal expansion. The bit body also includes insert disposed in the bit body. The insert has a second coefficient of thermal expansion that is greater than the first coefficient of thermal expansion of the matrix.