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 Bismuth, Manganese and Chromic Oxides, 1350 °C (Masuyama 1972, Ex. 3)
Masuyama, Matsuoka and Nishi found that adding two more oxides to zinc oxide and bismuth oxide gives excellent non-linear properties. This is their Example 3 with manganese dioxide and chromic oxide: 98.5 % zinc oxide and 0.5 % each of bismuth oxide, manganese dioxide and chromic oxide by moles, sintered at 1350 °C. The disc measured a C-value of 303 at 1 mA and a nonlinearity exponent n of 20.0.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 3. Unknown: how the aluminium is sprayed on and what the silver paint is. The 10 g batch is our arithmetic. Picture: the patent's drawing.
Lengra kominn
1 day
Leiðbeiningar
1
1
Weigh 98.5 : 0.5 : 0.5 : 0.5 and wet-mill 5 hours
Weigh 98.5 : 0.5 : 0.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide, bismuth oxide, manganese dioxide and chromic oxide 98.5 : 0.5 : 0.5 : 0.5 by moles. Ours, for 10 g: 9.579 g zinc oxide, 0.278 g bismuth oxide, 0.052 g manganese dioxide, 0.091 g chromic oxide (our arithmetic). Mill wet for 5 hours, then dry. Unknown: the milling liquid.
Efni fyrir þetta skref:
Sinkoxíðduft9.579 g
Bismútoxíð0.278 g
Mangandíoxíð (pýrólúsít)0.052 g
Krómoxíð0.091 gNauðsynleg verkfæri:
Skálavog
Járnkúlukvörn
Þurrkofn2
2
Press discs 13 mm by 2.5 mm
Press discs 13 mm by 2.5 mm
Press the powder in a mould into 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
Sinter the discs in air at 1350 °C for 1 hour, then let them cool in the furnace to room temperature (about 15-30 °C).
Nauðsynleg verkfæri:
Múffluofn4
4
Lap to 10 mm by 1.5 mm
Lap to 10 mm by 1.5 mm
Lap both faces with 600-mesh silicon carbide. The finished disc is 10 mm across and 1.5 mm thick.
Nauðsynleg verkfæri:
KísilkarbíðkornSkífmælir5
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. Unknown: the spraying method and the paint.
Efni fyrir þetta skref:
Álhleifur1 as required
Leiðandi silfurmálning1 as required
Koparvír2 stykkiNauðsynleg verkfæri:
Óþekkt málmúðunaraðferðSkífmælirEfni
7- 9.579 gStaðgengill
- 0.278 gStaðgengill
- 0.052 gStaðgengill
- 0.091 gStaðgengill
- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 2 stykkiStaðgengill
Þessi teikning býr til
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.
Studdu smiðinn með því að kaupa vörur í gegnum teikningu hans þar sem hann fær þóknun smiða sem seljendur ákvarða, eða búðu til nýja endurskoðun á þessari teikningu og tengdu hana sem tengingu í þinni eigin teikningu til að deila tekjum.