US2004050114A1PendingUtilityA1
Method for making mineral wool, cobalt-based alloys therefor and other uses
Priority: May 23, 2000Filed: May 23, 2001Published: Mar 18, 2004
Est. expiryMay 23, 2020(expired)· nominal 20-yr term from priority
C22C 19/07C03B 37/047C03B 37/095C22F 1/10
39
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
The process for manufacturing mineral wool by internal centrifuging is characterized in that the temperature of the mineral material in the fiberizing spinner dish is at least 1150° C. and in that the fiberizing spinner dish is made of a cobalt-based alloy comprising the following elements (in percentages by weight of the alloy): Cr 23 to 34% Fe less than 3% Ni 6 to 12% Si less than 1% Ta 3 to 10% Mn less than 0.5% C 0.2 to 1.2% Zr less than 0.1% W 0 to 8%, the balance consisting of cobalt and inevitable impurities and the tantalum-to carbon molar ration being at least 0.3. Alloys particularly suitable for this process satisfy the above formula and do not contain tungsten. The alloys according to the invention can be used for other purposes in an oxidizing atmosphere at a temperature of at least 1100° C.
Claims
exact text as granted — not AI-modified1 . Process for manufacturing mineral wool by internal centrifuging, in which a stream of molten mineral material is poured into a fiberizing spinner dish, the peripheral band of which is pierced by a multitude of orifices through which filaments of molten mineral material escape, these filaments then being attenuated into wool due to the action of a gas, characterized in that the temperature of the mineral material in the spinner dish is at least 1100° C. and in that the fiberizing spinner dish is made of a cobalt-based alloy comprising the following elements (in percentages by weight of the alloy):
Cr
23 to 34%
Ni
6 to 12%
Ta
3 to 10%
C
0.2 to 1.2%
W
0 to 8%
Fe
less than 3%
Si
less than 1%
Mn
less than 0.5%
Zr
less than 0.1%,
the balance consisting of cobalt and inevitable impurities, the molar ratio of tantalum to carbon being at least 0.3.
2 . Process according to claim 1 , characterized in that the mineral composition has a ferric iron content, expressed as Fe 2 O 3 , of at least 3% by weight, especially at least 5% by weight.
3 . Process according to either of the preceding claims, characterized in that the mineral composition comprises the following percentages by weight:
SiO 2
39-55%,
preferably
40-52%
Al 2 O 3
16-27%,
—
16-25%
CaO
3-35%,
—
10-25%
MgO
0-15%,
—
0-10%
Na 2 O
0-15%,
—
6-12%
K 2 O
0-15%,
—
3-12%
R 2 O (Na 2 O +K 2 O)
10-17%,
—
12-17%
P 2 O 5
0-3%,
—
0-2%
Total iron (expressed as Fe 2 O 3 )
0-15%,
—
4-12%
B 2 O 3
0-8%,
—
0-4%
TiO 2
0-3%,
MgO being between 0 and 5%, especially between 0 and 2%, when R 2 O≦13.0%
4 . Process according to any one of the preceding claims, characterized in that the composition of the alloy of the spinner dish includes from 5.5 to 9% by weight of tantalum.
5 . Process according to any one of the preceding claims, characterized in that the composition of the alloy of the spinner dish has a Ta/C molar ratio of greater than or equal to 0.9.
6 . Process according to claim 5 , characterized in that the composition of the alloy of the spinner dish includes from 0.3 to 0.55% by weight of carbon.
7 . Process according to any one of the preceding claims, characterized in that the composition of the alloy includes from 0.8 to 1.2% by weight of carbon.
8 . Process according to claim 7 , characterized in that the composition of the alloy of the spinner dish has a Ta/C molar ratio of about 0.3 to 0.5.
9 . Process according to any one of the preceding claims, characterized in that the composition of the alloy of the spinner dish is tungsten-free.
10 . Process according to claim 9 , characterized in that the molten mineral material has a liquidus temperature of about 1140° C. or higher.
11 . Cobalt-based alloy exhibiting high-temperature mechanical strength in an oxidizing medium, which also includes chromium, nickel, tantalum and carbon, characterized in that it does not contain tungsten and in that it is essentially composed of the following elements (the proportions being indicated as percentages by weight of the alloy):
Cr
23 to 34%
Ni
6 to 12%
Ta
3 to 10%
C
0.2 to 1.2%
Fe
less than 3%
Si
less than 1%
Mn
less than 0.5%
Zr
less than 0.1%,
the balance consisting of cobalt and inevitable impurities and theTa/C molar ratio being at least 0.3.
12 . Alloy according to claim 11 , characterized in that the proportions of the elements are in the following ranges:
Cr
26 to 32%
Ni
8 to 10%
Ta
4.5 to 9%
C
0.3 to 1.1%.
13 . Alloy according to claim 11 or 12 , characterized in that the tantalum-to-carbon molar ratio is at least 0.9.
14 . Alloy according to claim 13 , characterized in that the carbon content is about 0.3 to 0.55%.
15 . Alloy according to claim 11 or 12 , characterized in that the carbon content is about 0.8 to 1.2%.
16 . Alloy according to claim 11 or 12 , characterized in that the Ta/C molar ratio is about 0.3 to 0.5.
17 . Cobalt-based alloy exhibiting high-temperature mechanical strength in an oxidizing medium, which also includes chromium, nickel, tantalum and carbon, characterized in that it is essentially composed of the following elements (the proportions indicated being the percentages by weight of the alloy).
Cr
23 to 34%
Ni
6 to 12%
Ta
4.2 to 10%
W
4 to 8%
C
0.8 to 1.2%
Fe
less than 3%
Si
Iess than 1%
Mn
less than 0.5%
Zr
less than 0.1%,
the balance consisting of cobalt and inevitable impurities and the Ta/C molar ratio being at least 0.3, preferably at least 0.35 and advantageously about 0.35 to 0.5.
18 . Article, especially an article that can be used in particular for the production or hot-conversion of glass, made of an alloy according to any one of claims 11 to 17 , especially by foundrywork.
19 . Article according to claim 18 , obtained by foundrywork.
20 . Article according to claim 19 , having undergone a heat treatment after the alloy was cast.
21 . Article according to claim 19 , having undergone a forging operation after the alloy was cast.
22 . Article according to one of claims 18 to 21 , consisting of a fiberizing spinner dish for the manufacture of mineral wool.
23 . Process for manufacturing an article according to claim 20 , comprising the casting of the molten alloy in a suitable mould, and a heat treatment of the moulded article comprising a first annealing step at a temperature of 1100 to 1250° C. and a second annealing step at a temperature of 850 to 1050° C.
24 . Use, in an oxidizing atmosphere at a temperature of at least 1100° C., of an article made of a cobalt-based alloy comprising the following elements (in percentages by weight of the alloy):
Cr
23 to 34%
Ni
6 to 12%
Ta
3 to 10%
C
0.2 to 1.2%
W
0 to 8%
Fe
less than 3%
Si
less than 1%
Mn
less than 0.5%
Zr
less than 0.1%,
the balance consisting of cobalt and inevitable impurities and the tantalum-to-carbon molar ratio being at least 0.3.Join the waitlist — get patent alerts
Track US2004050114A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.