http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1007363-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3492a7406879265b1f567f37d98dbbaf |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C21D1-70 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C21D1-70 |
| filingDate | 1963-07-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1965-10-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1007363-A |
| titleOfInvention | Improvements in or relating to annealing cube texture iron-silicon sheets |
| abstract | A process for producing iron-silicon magnetic sheets having a high volumetric proportion of cube texture grains, said process including annealing the iron silicon sheets in stacks or coils for obtaining the cube texture transformation, characterized in that during the transformation anneal, the sticking of adjacent sheet surfaces is prevented by coating at least one side of each sheet with a non-reactive material comprising a slurry of water and a solid material in powder form comprising predominantly a -phase alumina, said powder being obtained by either (a) decomposition of an aluminium salt, e.g. aluminium sulphate, hydrated aluminium chloride, aluminium nitrate; (b) precipitation from an aluminium-containing alkali solution, e.g. by treating an aqueous solution of aluminium sulphate with ammonia or sodium carbonate such that the resultant solution has a pH value of less than 7; or (c) calcining bauxite powder containing by weight at least 86% Al2O3 and a maximum of 6.5% SiO2 and 3% TiO2, which method may be followed by heating the calcined bauxite powder in a dry hydrogen atmosphere at a temperature between 1000 DEG C. and 1400 DEG C. The average particle size of the powder, preferably does not exceed 325 mesh (130 openings per linear cm.). Iron silicon steel may be obtained with up to about 90-95% cube texture. Specification 995,581 is referred to.ALSO:Alpha-phase alumina is obtained by thermal decomposition of an aluminium salt followed by calcining; e.g. commercial Al2(SO4)3.18H2O may be heated for 16 hours at 150-200 DEG C., decomposed by heating to between 1000-1100 DEG C. in air for 3 hours and calcined in air for 16 hours at 1150 DEG C.; or may be formed by precipitation from an aluminium containing acidic solution and calcining the precipitated alumina; e.g. by treating an aqueous acidic solution of aluminium sulphate with ammonia or sodium carbonate to precipitate hydrous alumina, which is then washed, heated to drive off absorbed water, and calcined at 1000-1400 DEG C., to form alpha-phase alumina. Specification 945,581 is referred to. |
| priorityDate | 1962-07-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 30.