An iron-based powder for powder metallurgy includes an iron-based powder and a composite oxide powder, and the composite oxide contains, by mass, from 15% to 30% Si, from 9% to 18% Al, from 3% to 6% B, from 0.5% to 3% Mg, from 2% to 6% Ca, from 0.01% to 1% Sr, and from 45% to 55% O.

A method of forming a macrocomposite including dispersing or immersing a first material in a second material. The first material includes a stone and the second material a glass; or the first material may be glass and the second material stone. The macrcocomposite may further include metal. Preferably, the macrocomposite does not include an organic resin, an adhesive, or a polymer.

A method of manufacturing a polarizing glass sheet includes subjecting, while heating, a glass preform sheet containing metal halide particles to down-drawing, to thereby provide a glass member having stretched metal halide particles dispersed in an aligned manner in a glass matrix, and subjecting the glass member to reduction treatment to reduce the stretched metal halide particles, to thereby provide a polarizing glass sheet. A shape of the glass preform sheet during the down-drawing satisfies a relationship of the following expression:

L.sub.1/W.sub.11.0

where L.sub.1 represents a length between a portion in which a width of the glass preform sheet has changed to 0.8 times an original width and a portion in which the width of the glass preform sheet has changed to 0.2 times the original width W.sub.0, and W.sub.1 represents a length equivalent to 0.5 times the original width W.sub.0 of the glass preform sheet.

The disclosure is directed to broadband, glass optical polarizers and to methods for making the glass optical polarizers. The glass optical polarizer includes a substantially bubble free fusion drawn glass having two pristine glass surfaces and a plurality of elongated zero valent metallic particle polarizing layers.

A wear resistant article including a substrate and a bulk metallic glass coating including an alloy of a base metal, a transition metal, boron, and silicon, wherein the bulk metallic glass coating has a thickness of about 0.05 millimeter or greater and a functionally graded microstructure. A method of producing an article with a wear resistant coating by additively printing a bulk metallic glass coating onto at least a portion of the article.

The disclosure is directed to broadband, glass optical polarizers and to methods for making the glass optical polarizers. The glass optical polarizer includes a substantially bubble free fusion drawn glass having two pristine glass surfaces and a plurality of elongated zero valent metallic particle polarizing layers.

A method of manufacturing a polarizing glass sheet includes subjecting, while heating, a glass preform sheet containing metal halide particles to down-drawing, to thereby provide a glass member having stretched metal halide particles dispersed in an aligned manner in a glass matrix, and subjecting the glass member to reduction treatment to reduce the stretched metal halide particles, to thereby provide a polarizing glass sheet. A shape of the glass preform sheet during the down-drawing satisfies a relationship of the following expression:
L.sub.1/W.sub.11.0
where L.sub.1 represents a length between a portion in which a width of the glass preform sheet has changed to 0.8 times an original width and a portion in which the width of the glass preform sheet has changed to 0.2 times the original width W.sub.0, and W.sub.1 represents a length equivalent to 0.5 times the original width W.sub.0 of the glass preform sheet.

A magnetic-disk glass substrate containing an alkali metal component as a glass composition includes a pair of main surfaces and an outer circumferential side edge surface that is a mirror surface. The outer circumferential side edge surface includes a surface with a roughness percentage that is 40% or more when a bearing ratio of a roughness cross-sectional area is 50%, in a bearing ratio curve of roughness cross-sectional areas obtained when a surface roughness of the outer circumferential side edge surface obtained by etching the outer circumferential side edge surface by 2.5 m is measured.

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.

A glass composition, a macrocomposite, and methods of forming the macrocomposite including dispersing or immersing a metal in a glass. Preferably, the macrocomposite does not include an organic resin, an adhesive, or a polymer.