GB901317A - Production of cellulated silica - Google Patents
Production of cellulated silicaInfo
- Publication number
- GB901317A GB901317A GB277759A GB277759A GB901317A GB 901317 A GB901317 A GB 901317A GB 277759 A GB277759 A GB 277759A GB 277759 A GB277759 A GB 277759A GB 901317 A GB901317 A GB 901317A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nitrogen
- boron
- carbon
- atmosphere
- boron compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C11/00—Multi-cellular glass ; Porous or hollow glass or glass particles
- C03C11/007—Foam glass, e.g. obtained by incorporating a blowing agent and heating
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Secondary Cells (AREA)
Abstract
A powdered mixture of silica and a carbonaceous cellulating agent such as carbon, is heated in a carbon mould internally coated with boron nitride, to 2600-2950 DEG F. in a non-oxidizing atmosphere and finally to 3200-3300 DEG F. to allow reaction to occur between the silica and the cellulating agent. The coating of boron nitride is formed by heating the carbon mould to at least 1000 DEG F. in a nitrogen-containing atmosphere in the presence of a boron compound such as the oxide, hydride, trichloride, trifluoride, boric acid or elemental boron. The nitrogen containing atmosphere may be nitrogen, nitrogen containing 1-10% by volume of hydrogen produced gas, ammonia, nitrogen and argon, hydrazine, hydroxylamine, cyanogen, or the pyrolysis products of potassium and calcium cyanamide. The boron compound is either used in the solid state or the carbon mould may first be impregnated with an aqueous or organic solution of the boron compound and then heated in the nitrogen atmosphere. Specification 742,016, U.S.A. Specifications 2,890,126, 2,890,127 and 2,890,173 are referred to.ALSO:A carbon mould is coated with boron nitride by heating the mould to at least 1000 DEG F. in a nitrogen containing atmosphere in the presence of a boron compound such as the oxide, hydride, trichloride, trifluoride, boric acid or elemental boron. The nitrogen containing atmosphere may be nitrogen, nitrogen plus 1-10% by volume of hydrogen, produced gas, ammonia, nitrogen and argon, hydrazine, hydroxylamine, cyanogen, or the pyrolysis products of potassium and calcium cyanamide. The boron compound is either applied to the carbon in the solid state or an aqueous or organic solution of the boron compound is impregnated into the carbon prior to heating in the nitrogen atmosphere. Specification 742,016 and U.S.A. Specifications 2,890,126, 2,890,127 and 2,890,173 are referred to.ALSO:A carbon mould is coated with boron nitride by heating the carbon mould to at least 1000 DEG F. in a nitrogen containing atmosphere in the presence of a boron containing compound such as the oxide, hydride, trichloride, trifluoride, boric acid or elemental boron. The boron compound may be used in the solid state or the carbon may first be impregnated with an aqueous or organic solution of the boron compound and then heated in the nitrogen atmosphere. Specification 742,016, U.S.A. Specifications 2,890,126, 2,890,127 and 2,890,173 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71207058A | 1958-01-30 | 1958-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB901317A true GB901317A (en) | 1962-07-18 |
Family
ID=24860662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB277759A Expired GB901317A (en) | 1958-01-30 | 1959-01-26 | Production of cellulated silica |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE575257A (en) |
| GB (1) | GB901317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2171039A (en) * | 1985-02-15 | 1986-08-20 | Ontario Research Foundation | Providing an oxidation resistant refractory coating on a graphite mold |
-
1959
- 1959-01-26 GB GB277759A patent/GB901317A/en not_active Expired
- 1959-01-30 BE BE575257A patent/BE575257A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2171039A (en) * | 1985-02-15 | 1986-08-20 | Ontario Research Foundation | Providing an oxidation resistant refractory coating on a graphite mold |
Also Published As
| Publication number | Publication date |
|---|---|
| BE575257A (en) | 1959-05-15 |
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