Mold material mixtures on the basis of inorganic binders, and method for producing molds and cores for metal casting
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B22C-001/18
B22C-009/02
출원번호
US-0690750
(2015-04-20)
등록번호
US-10092946
(2018-10-09)
우선권정보
DE-10 2012 020 509 (2012-10-19)
발명자
/ 주소
Bartels, Dennis
Deters, Heinz
Gieniec, Antoni
Koch, Diether
Lincke, Hannes
Oberleiter, Martin
Schmidt, Oliver
Wallenhorst, Carolin
출원인 / 주소
ASK CHEMICALS GMBH
대리인 / 주소
Standley Law Group LLP
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
The invention relates to mold material mixtures on the basis of inorganic binders, for producing molds and cores for metal casting. Said mixtures consist of at least one refractory mold base material, an inorganic binder and amorphous silicon dioxide as an additive. The invention also relates to a m
The invention relates to mold material mixtures on the basis of inorganic binders, for producing molds and cores for metal casting. Said mixtures consist of at least one refractory mold base material, an inorganic binder and amorphous silicon dioxide as an additive. The invention also relates to a method for producing molds and cores using said mold material mixtures.
대표청구항▼
1. A mixture for producing molding forms and cores for metal processing, comprising: a refractory mold base material;an inorganic binder; anda particulate amorphous SiO2, obtained by thermal decomposing ZrSiO4 to ZrO2 and SiO2, such that the particulate amorphous SiO2 comprises zirconium compounds,
1. A mixture for producing molding forms and cores for metal processing, comprising: a refractory mold base material;an inorganic binder; anda particulate amorphous SiO2, obtained by thermal decomposing ZrSiO4 to ZrO2 and SiO2, such that the particulate amorphous SiO2 comprises zirconium compounds, calculated as ZrO2, in an amount of greater than 0.01 wt. % to smaller than 12 wt. %. 2. The mixture of claim 1, wherein the particulate amorphous SiO2 has a Brunauer-Emmett-Teller surface area in the range of from 1 m2/g to 35 m2/g. 3. The mixture of claim 2, wherein the particulate amorphous SiO2 has a mean particle size (diameter), as determined by dynamic light scattering that is between 0.05 μm and 10 μm. 4. The mixture of claim 1, wherein the particulate amorphous SiO2 is present at 0.1 to 2 wt. %, based on the weight of the refractory mold base material. 5. The mixture of claim 1, wherein the particulate amorphous SiO2 has a water content of less than 10 wt. %. 6. The mixture of claim 1, wherein the mixture contains organic compounds at a maximum of 1 wt. %. 7. The mixture of claim 1, wherein the inorganic binder is selected from the group consisting of: water-soluble phosphate glass, a water-soluble borate and water glass with a SiO2/M2O molar ratio in the range of 1.6 to 4.0, wherein M represents lithium, sodium and potassium. 8. The mixture of claim 1, further comprising water glass in the amount of 0.5 to 5 wt. % water glass, based on the refractory mold base material, the solids fraction of the water glass amounting to 25 to 65 wt. %. 9. The mixture of claim 1, further comprising at least one anionic surfactant. 10. The mixture of claim 9, wherein the anionic surfactant is present in a fraction of 0.001 to 1 wt. %, based on the weight of the refractory mold base material. 11. The mixture of claim 1, further comprising graphite. 12. The mixture of claim 1, further comprising at least one phosphorus-containing compound. 13. The mixture of claim 1, wherein the particulate amorphous SiO2 is used as a powder. 14. The mixture of claim 1, further comprising a curing agent. 15. A method for producing a casting mold or cores, comprising the steps of: preparing a mold material mixture according to claim 1;placing the prepared mold material mixture into a mold, andcuring the prepared mold material mixture in the mold. 16. The method of claim 15, in which the step of placing the mold material mixture into the mold is achieved with a core shooting machine using compressed air, where the mold is a molding tool that has one or more gases flowing through it. 17. The method according to claim 15, wherein the curing step is practiced by exposing the mold material mixture to a temperature of at least 100° C. for less than 5 min. 18. The mixture of claim 1, wherein the particulate amorphous SiO2 has a Brunauer-Emmett-Teller surface area in the range of from 1 m2/g to 17 m2/g. 19. The mixture of claim 18, wherein the particulate amorphous SiO2 has a mean particle size (diameter), as determined by dynamic light scattering that is between 0.1 μm and 5 μm. 20. The mixture of claim 1, wherein the particulate amorphous SiO2 is present at 2 to 60 wt. %, based on the weight of the inorganic binder, wherein the solids fraction of the inorganic binder amounts to 25 to 65 wt. %. 21. A mixture for producing molding forms and cores for metal processing, comprising: a refractory mold base material;an inorganic binder based on water glass with a SiO2/M2O molar ratio in the range of 1.6 to 4.0, wherein M represents lithium, sodium and potassium; anda particulate amorphous SiO2 that is obtained by thermal decomposing ZrSiO4 to ZrO2 and SiO2, such that the particulate amorphous SiO2 has a mean particle size (diameter), as determined by dynamic light scattering that is between 0.05 μm and 10 μm, the particulate amorphous SiO2 being present at an amount of from 0.1 to 2 wt. %, with the particulate amorphous SiO2 comprising zirconium compounds, calculated as ZrO2, in an amount of greater than 0.01 wt. % to smaller than 12 wt. %, based on the total weight of the amorphous SiO2.
Binder Dieter (Alzenau DEX) Kleinschmit Peter (Hanau DEX) Zetzmann Klaus (Kleinostheim DEX) Hoffmeister Hans (Gelnhausen DEX), Thermally split zirconium silicate, method of its production and use.
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