LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Metal Oxide Varistor: Pure Zinc Oxide at 1350 °C, Bismuth Oxide Paste Fired at 600 °C (Masuyama 1972, Ex. 4)
A varistor made the other way round: a disc of pure zinc oxide, sintered, with bismuth oxide fired into its faces from a paste instead of mixed in. Sintered at 1350 °C and fired with the paste at 600 °C, the disc measured a C-value of 13 at 1 mA and a nonlinearity exponent n of 4.2. Masuyama found that firing on the bismuth oxide paste raises n a great deal over mixing it in.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 4. Unknown: how the aluminium is sprayed on, what the silver paint is, and how strong the epoxy solution of the paste is. The 10 g batch is our arithmetic. Picture: the patent's drawing.
Lengra kominn
2 days
Leiðbeiningar
1
1
Press pure zinc oxide at 340 kg/cm²
Press pure zinc oxide at 340 kg/cm²
Press zinc oxide powder at 340 kg/cm². Example 4 gives no disc size; ours: discs 13 mm across and 2.5 mm thick in the mould of Example 1.
Efni fyrir þetta skref:
Sinkoxíðduft1 as requiredNauðsynleg verkfæri:
Skálavog
Vökvapressa
Pressumót fyrir skífur
Skífmælir2
2
Sinter 1 hour at 1350 °C and cool
Sinter 1 hour at 1350 °C and cool
Heat the pressed disc for 1 hour at 1350 °C, then let it cool to room temperature.
Nauðsynleg verkfæri:
Múffluofn3
3
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 4 gives no thickness.
Nauðsynleg verkfæri:
KísilkarbíðkornSkífmælir4
4
Coat with bismuth oxide paste and fire at 600 °C
Coat with bismuth oxide paste and fire at 600 °C
Coat both lapped faces with a paste of 50 % by weight bismuth oxide in a solution of epoxy resin in butyl alcohol, and fire it in air at 600 °C for 30 minutes. The bismuth oxide diffuses into the zinc oxide. Not given: how much paste, or the strength of the epoxy solution.
Efni fyrir þetta skref:
Bismútoxíð1 as requiredNauðsynleg verkfæri:
Epoxýkvoða
n-BútanólMúffluofn5
5
Spray aluminium electrodes and attach leads
Spray aluminium electrodes and attach leads
Spray a metallised film of aluminium on both faces. Attach a lead wire to each with conductive silver paint, as in Example 1. Unknown: the spraying method and the paint.
Efni fyrir þetta skref:
Álhleifur1 as required
Leiðandi silfurmálning1 as required
Koparvír2 stykkiNauðsynleg verkfæri:
Óþekkt málmúðunaraðferðSkífmælirEfni
5- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 2 stykkiStaðgengill
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Tengd Blueprint
Þessi blueprint deila þekkingu — tækni, efni eða meginreglur
CC0 opinbert ríki
Þessi teikning er gefin út undir CC0. Þér er frjálst að afrita, breyta, dreifa og nota þetta verk í hvaða tilgangi sem er, án þess að biðja um leyfi.
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