Abstract: Provided are: spherical crystalline silica particles which ensure higher productivity and lower production costs than conventional ones, contain plenty of quartz having high thermal conductivity, have high fluidity, high dispersibility, high filling property, and low abrasion property, and are also applicable to semiconductor field; and a method for producing the spherical crystalline silica particles. The crystalline silica particles are characterized in that with respect to the total mass of the particles, the content of a crystal phase is at least 90 mass % and the content of a quartz crystal is at least 70 mass %. In addition, at least one kind of alkali metals may be contained in an amount of 0.4-5 mass % in terms of oxides, with respect to the total mass of the particles. Furthermore, at least one kind of alkaline earth metals may be contained in an amount of 1-5 mass % in terms of oxides, with respect to the total mass of the particles.

Abstract: Provided are: spherical crystalline silica particles which ensure higher productivity and lower production costs than conventional ones, contain plenty of quartz having high thermal conductivity, have high fluidity, high dispersibility, high filling property, and low abrasion property, and are also applicable to semiconductor field; and a method for producing the spherical crystalline silica particles. The crystalline silica particles are characterized in that with respect to the total mass of the particles, the content of a crystal phase is at least 90 mass % and the content of a quartz crystal is at least 70 mass %. In addition, at least one kind of alkali metals may be contained in an amount of 0.4-5 mass % in terms of oxides, with respect to the total mass of the particles. Furthermore, at least one kind of alkaline earth metals may be contained in an amount of 1-5 mass % in terms of oxides, with respect to the total mass of the particles.

Abstract: The present invention addresses the problem of providing: spherical eucryptite particles which have higher circularity than in the prior art, have a large negative thermal expansion and a high thermal conductivity, have high flowability, dispersibility, and filling capability, and are also applicable in the field of semiconductors; and a method for producing the spherical eucryptite particles. As a means for solving the problem, the present invention provides: the method for producing the spherical eucryptite particles characterized by heat treating, at 600 to 1100° C., spherical particles which have been thermally sprayed with a feedstock powder that includes 45 to 55 mol % of SiO2, 20 to 30 mol % of Al2O3, and 20 to 30 mol % of Li2O, and obtaining spherical particles that include 89% or more of a eucryptite crystalline phase; and the spherical eucryptite particles obtained by this method.

Abstract: Spherical crystalline silica particles having a higher productivity, lower production cost, higher coefficient of thermal expansion, higher heat transmission rate, higher fluidity, higher dispersability, higher fill factor, low abrasiveness, and higher purity compared with the past and able to be applied in the semiconductor field and a process of production of the same are provided. Spherical crystalline silica particles containing 400 to 5000 ppm of aluminum and containing 80% or more of crystal phases are provided.

Abstract: Spherical crystalline silica particles having a higher productivity, lower production cost, higher coefficient of thermal expansion, higher heat transmission rate, higher fluidity, higher dispersability, higher fill factor, low abrasiveness, and higher purity compared with the past and able to be applied in the semiconductor field and a process of production of the same are provided. Spherical crystalline silica particles containing 400 to 5000 ppm of aluminum and containing 80% or more of crystal phases are provided.

Abstract: A weight bearing brace for a patient having femur or hip joint trouble has an upper socket removably attached to the periphery of an upper part of a thigh; a lower socket removably attached to the periphery of a lower part of the thigh; connectors for connecting the upper and lower sockets to each other, bearing patient's weight, and maintaining a required space between the upper and lower sockets; and a pelvis supporter disposed at an upper end of the upper socket, to substantially receive the weight of the upper half of the patient. The patient with the brace is able to move the hip joint. The pelvis supporter supports a lower part of the pelvis, to directly transfer the weight of the upper half of the patient from the upper socket to the lower socket, thereby avoiding the femur and hip joint from receiving the weight. The brace has a simple structure, is low cost, is easily attached to and detached from a thigh, and allows a knee joint with the brace to move, to smoothly carry out rehabilitation.