Powder made of iron-base metallic glass

Patent metadata

Field	Value
Publication number	US-9840760-B2
Application number	US-201314440521-A
Country	US
Kind code	B2
Filing date	Jun 26, 2013
Priority date	Mar 4, 2013
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

The present invention is to provide powder made of iron-based metallic glass, the corrosion resistance of which is improved over the conventional powder made of iron-based metallic glass. The basic composition includes a group of iron-based metallic elements that predominantly has Fe, a group of metalloid elements that consists of Si, B, P, and C, and a little amount of a group of elements for improving the degree of supercooling that consists of either or both of Nb and Mo. The powder made of the iron-based metallic glass is obtained by adding to the basic composition an element for improving the corrosion resistance. The obtained powder made of the iron-based metallic glass has an excellent corrosion resistance, an excellent magnetic property, and an excellent insulating property.

First claim

The invention claimed is:

1. Corrosion-resistant powder made of iron-based metallic glass, wherein the iron-based metallic glass comprises one or more iron-group elements, a group of metalloid elements, and at least one element M for improving a degree of supercooling (M: either or both of Nb and Mo), wherein a nominal composition of the iron-based metallic glass is expressed by (Fe 1-s-t Co s Ni t ) 100-x-y {(Si a B b ) m (P c C d ) n } x M y
wherein ratios of the compositions of the group of iron-based metallic elements are 19≦x≦30, 0<y≦6.0, 0≦s≦0.35, 0≦t≦0.35, and s+t≦0.35,
wherein ratios of the compositions of the group of metalloid elements are (0.5:1)≦(m:n)≦(6:1); (2.5:7.5)≦(a:b)≦(5.5:4.5); and (8.0:2.0)≦(c:d)≦(8.5:1.5),
further comprising either or both of Cr and Zr as an element for improving corrosion resistance of the powder, the content of the Cr and Zr being 0.30-50 wt % in relation to the total contents of all the elements in the nominal composition, and further comprising Al in a content of 0.01-0.75 wt % for improving the corrosion resistance of the powder, and the total content of the Cr, Zr and Al being 1.0-5.0 wt %.

2. The corrosion-resistant powder made of the iron-based metallic glass of claim 1 , wherein the nominal composition is expressed by Fe 100-x-y {(Si a B b ) m (P c C d ) n } x M y .

3. The corrosion-resistant powder made of the iron-based metallic glass of claim 1 , wherein 0.05≦y≦2.4.

4. The corrosion-resistant powder made of the iron-based metallic glass of claim 3 , wherein (1.5:1)≦(m:n)≦(5.5:1); and (3.5:6.5)≦(a:b)≦(5.5:4.5).

5. The corrosion-resistant powder made of the iron-based metallic glass of claim 1 , further including at least one accessory element for improving corrosion resistance selected from V, Ti, Ta, Cu, and Mn, wherein a content of the accessory elements for improving corrosion resistance is 0.03-0.70 wt %.

6. The corrosion-resistant powder made of the iron-based metallic glass of claim 1 , wherein a diameter of a particle of the powder is 0.5-50 μm.

7. The corrosion-resistant powder made of the iron-based metallic glass of claim 1 , wherein the powder is manufactured by water atomization.

8. The corrosion-resistant powder made of the iron-based metallic glass of claim 1 , further comprising at least one of V, Ti, Ta, Cu, and Mn for improving the corrosion resistance of the powder.

Assignees

• Sintokogio Ltd

Inventors

• Kino Yasushi
• Hayashi Shingo
• Harada Takuya

Classifications

• C22C1/11

  Making amorphous alloys · CPC title

• C22C45/02

  with iron as the major constituent · CPC title

• H01B3/02

  mainly consisting of inorganic substances · CPC title

• B22F9/08

  by casting, e.g. through sieves or in water, by atomising or spraying (using electric discharge B22F9/14) · CPC title

• C22C33/003

  making amorphous alloys · CPC title