ES8401146A1 - Stable aq. suspension contg. inactive magnesia and phosphate - Google Patents
Stable aq. suspension contg. inactive magnesia and phosphateInfo
- Publication number
- ES8401146A1 ES8401146A1 ES512159A ES512159A ES8401146A1 ES 8401146 A1 ES8401146 A1 ES 8401146A1 ES 512159 A ES512159 A ES 512159A ES 512159 A ES512159 A ES 512159A ES 8401146 A1 ES8401146 A1 ES 8401146A1
- Authority
- ES
- Spain
- Prior art keywords
- suspension
- mgo
- cac
- phosphates
- stable
- 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
Landscapes
- Chemical Treatment Of Metals (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The suspension contains by wt. (a) 25% min. of MgO with a citric acid activity (CAC) above 200 seconds; (b) 2-25%, w.r.t. the wt. of (a), of P2O5 added as one or more of the phosphates of Ca, Mg, Al, ammonium polyphosphate, and/or H3PO4. The max. concn. of MgO in the suspension is 0.6 g/ccm; and the suspension does not settle in periods of up to 10 h. - The pref. suspension employs as cpd. (a) a mixt. of 50% MgO with CAC = 1500-3000 seconds, and 50% MgO with CAC 20-40 seconds. The suspension may also contain 0.1-0.15% boron and 5-10% TiO2, both w.r.t. the wt. of (a). The suspension is applied to Si steel sheet, which is then annealed to form a glass film while attaining the desired magnetic properties. - A high proportion of inactive MgO can be used in the suspension, which is stable and does not settle out rapidly. The CAC test is described in US3841925. DEAB- DE3218821 C Aq. slurry of magnesia for formation of insulating glass film on oriented Si steel sheet contains at least 25 wt.% of Mg oxide with a citric acid activity of more than 200 sec. and a phosphate-contg. cpd. selected from Ca phosphates, water-sol. ammonium polyphosphate, Mg phosphates, phosphoric acid and mixtures of these, in a proportion of 2-25 wt.%, calculated as P2O5. The magnesia is in a concn. of up to 0.6 g/cm3 and the slurry is stable against settling out for up to 10 hrs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES512159A ES8401146A1 (en) | 1982-05-13 | 1982-05-13 | Stable aq. suspension contg. inactive magnesia and phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES512159A ES8401146A1 (en) | 1982-05-13 | 1982-05-13 | Stable aq. suspension contg. inactive magnesia and phosphate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES512159A0 ES512159A0 (en) | 1983-11-16 |
| ES8401146A1 true ES8401146A1 (en) | 1983-11-16 |
Family
ID=8484136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES512159A Expired ES8401146A1 (en) | 1982-05-13 | 1982-05-13 | Stable aq. suspension contg. inactive magnesia and phosphate |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES8401146A1 (en) |
-
1982
- 1982-05-13 ES ES512159A patent/ES8401146A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES512159A0 (en) | 1983-11-16 |
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