LIST
FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
SKEMMTUN
UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
Metal Oxide Varistor: Zinc Oxide with 1 % Aluminium Oxide, Bismuth Oxide Paste Fired On (Masuyama 1972, Ex. 5)
A varistor with bismuth oxide fired on from a paste instead of mixed in: 99 % zinc oxide with 1 % aluminium oxide by moles, sintered at 1350 °C, coated with bismuth oxide paste and fired at 800 °C. The disc measured a C-value of 6.2 at 1 mA and a nonlinearity exponent n of 7.4.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 5. 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
Weigh 99 : 1 and wet-mill 5 hours
Weigh 99 : 1 and wet-mill 5 hours
Mix zinc oxide and aluminium oxide 99 : 1 by moles. Ours, for 10 g: 9.875 g zinc oxide and 0.125 g aluminium oxide (our arithmetic). Mill wet for 5 hours, then dry, as in Example 1. Unknown: the milling liquid.
Efni fyrir þetta skref:
Sinkoxíðduft9.875 g
Súrálsduft (áloxíð)0.125 gNauðsynleg verkfæri:
Skálavog
Járnkúlukvörn
Þurrkofn2
2
Press discs 13 mm by 2.5 mm
Press discs 13 mm by 2.5 mm
Press discs 13 mm across and 2.5 mm thick at 340 kg/cm², as in Example 1.
Nauðsynleg verkfæri:
Vökvapressa
Pressumót fyrir skífur
Skífmælir3
3
Sinter 1 hour at 1350 °C and furnace-cool
Sinter 1 hour at 1350 °C and furnace-cool
As in Example 2: sinter in air at 1350 °C for 1 hour and let the discs cool in the furnace.
Nauðsynleg verkfæri:
Múffluofn4
4
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 5 gives no thickness.
Nauðsynleg verkfæri:
KísilkarbíðkornSkífmælir5
5
Coat with bismuth oxide paste and fire at 800 °C
Coat with bismuth oxide paste and fire at 800 °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 800 °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-BútanólMúffluofn6
6
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
6- 9.875 gStaðgengill
- 0.125 gStaðgengill
- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 2 stykkiStaðgengill
Nauðsynleg verkfæri
11- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
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Tengd Blueprint
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CC0 opinbert ríki
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