# US 10,864,574 B2 · Core-shell particles for use as a filler for feeder compositions

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- Number: US 10,864,574 B2
- Document ID: US10864574B2
- Status: Granted
- Kind: B2
- Application number: 16/312,171
- Filed: 2017-06-27
- Published: 2019-07-04
- Granted: 2020-12-15
- Earliest claimed: 2016-06-30
- Assignees: HüTtenes-Albertus Chemische Werke Gesellschaft Mit BeschräNkter Haftung
- Applicants: HüTtens-Albertus Chemische Werke Gesellschaft Mit BeschräNkter Haftung
- Inventors: Sandra Lehmann; Klaus Riemann; Nils Zimmer; Hermann Lieber; Jürgen Hübert
- Web page: https://patentgrep.com/patent/US10864574B2

## CPC

- B22C 9/08: Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C 1/00: Compositions of refractory mould or core materials; Grain structures thereof (refractory materials in general C04B35/00); Chemical or physical features in the formation or manufacture of moulds
- B22C 1/02: characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C 1/18: of inorganic agents {(B22C1/162 takes precedence)}
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)

## Abstract

The invention relates to core-shell particles for use as a filler for feeder compositions for producing feeders, comprising (a) a core which possesses one or more cavities and a wall surrounding these cavities, where the core (a) has an average diameter in the range from 0.15 to 0.45 mm, (b) a shell enclosing the core and consisting of or comprising (b1) particles comprising or consisting of a material from the group consisting of calcined kaolin or cordierite, where the particles (b1) have a d10 of at least 0.05 μm and a d90 of at most 45 μm, and also (b2) a binder which binds the particles (b1) to one another and to the core (a).

## Claims

### Claim 1

Core-shell particles for use as a filler for feeder compositions for producing feeders, comprising:
(a) a core possessing one or more cavities and a wall surrounding the one or more cavities, where the core (a) has an average diameter in the range from 0.15 to 0.45 mm;
(b) a shell enclosing the core and consisting of or comprising:
(b1) particles comprising or consisting of a material selected from the group consisting of calcined kaolin and cordierite, where the particles (b1) have a d10 of at least 0.05 μm and a d90 of at most 45 μm; and
(b2) a binder which binds the particles (b1) to one another and to the core (a).

### Claim 2 (depends on 1)

The core-shell particles as claimed in claim 1, where the core (a) comprises glass or consists of glass.

### Claim 3 (depends on 1)

The core-shell particles as claimed in claim 1, where
the core (a) comprises silicon dioxide and aluminum oxide, the weight ratio between the silicon dioxide and the aluminum oxide being 27:1 or more,
in the particles (b1) the weight ratio between the silicon dioxide and the aluminum oxide is in the range from 1:1 to 1:1.6.

### Claim 4 (depends on 1)

The core-shell particles as claimed in claim 1, where
(i) the core-shell particles have a d10 in the range from 0.1 mm to 0.2 mm and a d90 in the range from at most 0.30 mm to 0.40 mm, where the core-shell particles have an average particle size d50 of 0.2 mm to 0.3 mm
or
(ii) the core-shell particles have a d10 in the range from 0.30 mm to 0.40 mm and a d90 in the range from 0.50 mm to 0.60 mm, where the core-shell particles have an average particle size d50 of 0.4 mm to 0.5 mm.

### Claim 5 (depends on 1)

The core-shell particles as claimed in claim 1, where
the core (a) comprises silicon dioxide and aluminum oxide, the weight ratio between the silicon dioxide and the aluminum oxide being 30:1 or more,
in the particles (b1) the weight ratio between the silicon dioxide and the aluminum oxide is in the range from 1:1 to 1:1.6.

### Claim 6 (depends on 1)

The core-shell particles as claimed in claim 1, where
the core (a) comprises silicon dioxide and aluminum oxide, the weight ratio between the silicon dioxide and the aluminum oxide being 45:1 or more,
in the particles (b1) the weight ratio between the silicon dioxide and the aluminum oxide is in the range from 1:1 to 1:1.6.

### Claim 7 (depends on 1)

The core-shell particles as claimed in claim 1, where
(i) the core-shell particles have a d10 in the range from 0.1 mm to 0.2 mm and a d90 in the range from at most 0.30 mm to 0.40 mm, where the core-shell particles have an average particle size d50 of 0.22 mm to 0.27 mm
or
(ii) the core-shell particles have a d10 in the range from 0.30 mm to 0.40 mm and a d90 in the range from 0.50 mm to 0.60 mm, where the core-shell particles have an average particle size d50 of 0.42 mm to 0.47 mm.

### Claim 8 (depends on 1)

The core-shell particles as claimed in claim 1, where
(i) the core-shell particles have a d10 in the range from 0.1 mm to 0.2 mm and a d90 in the range from at most 0.30 mm to 0.40 mm, where the core-shell particles have an average particle size d50 of 0.24 mm to 0.26 mm
or
(ii) the core-shell particles have a d10 in the range from 0.30 mm to 0.40 mm and a d90 in the range from 0.50 mm to 0.60 mm, where the core-shell particles have an average particle size d50 of 0.44 mm to 0.46 mm.

### Claim 9 (depends on 1)

The core-shell particles as claimed in claim 1, where the core (a) consists of or comprises expanded glass or foamed glass.

### Claim 10 (depends on 1)

A method for producing core-shell particles as claimed claim 1, comprising:
providing cores (a) which each possess one or more cavities and a wall surrounding the one or more cavities, where the cores (a) have a d50 in the range from 0.15 to 0.45 mm,
providing particles (b1) comprising or consisting of a material selected from the group consisting of calcined kaolin and cordierite, where the particles (b1) have a d10 of at least 0.05 μm and a d90 of at most 45 μm;
contacting the cores (a) with the particles (b1) in the presence of a binder (b2), so that particles (b1) are bound to the cores (a) and to one another, and individual or all the cores (a) are enveloped; and
curing and/or drying the binder.

### Claim 11 (depends on 1)

A method of producing a feeder or a moldable composition for producing a feeder, comprising providing the core-shell particles as claimed in claim 1 as an insulating filling material for the feeder.

### Claim 12 (depends on 1)

A pourable filling material for use as a filler for feeder compositions for producing feeders, comprising or consisting of a multiplicity of core-shell particles as claimed in claim 1.

### Claim 13 (depends on 1)

A moldable composition for producing feeders, consisting of or comprising:
core-shell particles as claimed in claim 1; and
a binder for binding the core-shell particles.

### Claim 14 (depends on 1)

A feeder comprising core-shell particles as claimed in claim 1, bound by a binder.

### Claim 15 (depends on 14)

A method of casting iron or steel comprising utilizing a feeder as claimed in claim 14.