Composite materials are provided which include a glass-ceramic matrix composition that is lightly crystallized, a fiber reinforcement within the glass-ceramic matrix composition which remains stable at temperatures greater than 1400 C., and an interphase coating formed on the fiber reinforcement. A method of making a composite material is also provided, which includes applying heat and pressure to a shape including fiber reinforcements and glass particles. The heat and pressure lightly crystallize a matrix material formed by the heat and pressure on the glass particles, forming a thermally stable composite material.

A method is provided for calculating gaseous diffusion and oxidation evolution of a ceramic matrix composite (CMC) structure, which includes determining temperature and load distribution in a structural member; determining matrix crack distribution in the structure; establishing an equivalent diffusion coefficient model of a fiber bundle scale to predict a gas flow channel in a fiber bundle: averaging a total amount of gaseous diffusion in the channel to establish the equivalent diffusion coefficient model of the fiber bundle composite scale related to the matrix crack distribution; establishing a representative volume element (RVE) model; establishing an equivalent diffusion coefficient model of a RVE scale; calculating the distribution of the gas concentration and oxidation products in the structure; calculating a growth thickness of an oxide at cracks and pores in each element; and updating sealing conditions of the gas channel, and calculating a new equivalent diffusion coefficient field and the distribution of the oxidation products again.

The purpose of the present invention is to provide a lead-free glass composition in which crystallization is suppressed and which has a low softening point. This lead-free glass composition is characterized by containing silver oxide, tellurium oxide and vanadium oxide, and further containing at least one compound selected from among yttrium oxide, lanthanum oxide, cerium oxide, erbium oxide, ytterbium oxide, aluminum oxide, gallium oxide, indium oxide, iron oxide, tungsten oxide and molybdenum oxide as an additional component, and in that the content values (mol %) of silver oxide, tellurium oxide and vanadium oxide satisfy the relationships Ag.sub.2O>TeO.sub.2?V.sub.2O.sub.5 and Ag.sub.5O?2V.sub.2O.sub.5 when calculated in terms of the oxides, and in that the content of TeO.sub.2 is 25-37 mol. %.

A crystallized glass raw material, characterized in that the crystallized glass raw material has a thickness of 0.02-5 mm, and the crystallized glass raw material has a crystallinity of 5-90 wt %. A preparation method for the crystallized glass raw material of the present invention has low processing difficulty and low processing cost; and the preparation method saves on time costs and also saves on energy for heat treatment.

A glass-ceramic substrate includes a continuous glass phase; a magnetizable component; and an antimicrobial component. The substrate can further include a discontinuous glass phase disposed in the continuous glass phase. The magnetizable component and the antimicrobial component can be disposed in the discontinuous glass phase. The substrate can include 45 percent to 60 percent SiO.sub.2; 3 percent to 6 percent P.sub.2O.sub.5; 3 percent to 10 percent B.sub.2O.sub.3; 4 percent to 8 percent K.sub.2O; 7 percent to 15 percent Fe.sub.2O.sub.3; and 15 percent to 25 percent CuO. A ratio of the mole percentage of CuO to Fe.sub.2O.sub.3 in the substrate can be 1.3 to 3.0. The magnetizable component can include one or more of delafossite and magnetite. The antimicrobial component can include one or more of cuprite and metallic copper. The substrate can exhibit a magnetic permeability of greater than or equal to 1.02?.sub.R at a frequency of 10,000,000 Hz.

[Problem] The aim of the present invention lies in providing a glass ceramic sintered compact in which dielectric loss in a high-frequency region is reduced, without any reduction in sintering density, and also in providing a wiring board employing same. [Solution] A glass ceramic sintered compact containing a glass component, a ceramic filler and a composite oxide, characterized in that the glass component is crystallized glass on which is deposited a diopside oxide crystal phase including at least Mg, Ca and Si, and the composite oxide includes at least Al and Co.

A magnetizable glass ceramic composition including: a continuous first glass phase including SiO.sub.2, B.sub.2O.sub.3, P.sub.2O.sub.5, and R.sub.2O; a discontinuous second glass phase including at least one of SiO.sub.2, B.sub.2O.sub.3, P.sub.2O.sub.5, R.sub.2O, or mixtures thereof; and a discrete magnetizable crystalline phase dispersed in the discontinuous second glass phase, where R.sub.2O is selected from at least one of K.sub.2O, Li.sub.2O, Na.sub.2O, or mixtures thereof. Also disclosed are a method of making and a method of using the magnetizable glass ceramic composition.

A method of fabricating a ceramic component includes processing a hybrid matrix blend formed of a ceramic precursor and a glass powder to form a hybrid matrix composite component. A polymer-derived ceramic component including a hybrid matrix composite formed of a hybrid matrix blend including at least one of a ceramic precursor and a conversion char, and a glass powder.

Provided is a glass ceramics sintered body including a glass phase and a ceramics phase dispersed in the glass phase, in which the ceramics phase includes alumina grains and zirconia grains, the glass phase includes an MO-Al.sub.2O.sub.3SiO.sub.2B.sub.2O.sub.3 based glass, in which M is an alkaline earth metal, and an area ratio of the alumina grains is 0.05 to 12% and the area ratio of the zirconia grains is 0.05 to 6% on the cross section of the sintered body. According to the invention, a glass ceramics sintered body, capable of a low temperature sintering having a low dielectric constant and a sufficient strength, and a coil electronic component using thereof can be provided.

[Summary] One embodiment of the present invention provides a powder. The powder includes ZnO, Al2O3, and SiO2 as components. In a ternary phase diagram of the ZnO, the Al2O3, and the SiO2, the powder has a composition included in a rectangular area having as the four corners thereof (ZnO (mol %), Al2O3 (mol %), SiO2 (mol %))=(24, 13, 63), (19, 18, 63), (37, 12, 51), (32, 17, 51). The ratio (S001/S101) of the area S001 of a peak appearing in the range of 15??2??17? and the area S101 of a peak appearing in the range of 24??2??27? in an X-ray diffraction pattern is 0.001-0.07.