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 0.5 % Boric Oxide, Bismuth-Manganese Oxide Paste Fired On (Masuyama 1972, Ex. 7)
A varistor whose bismuth oxide and manganese dioxide are both fired on from a paste: 99.5 % zinc oxide with 0.5 % boric oxide by moles, sintered at 1350 °C, coated with a 70 : 30 bismuth oxide and manganese dioxide paste and fired at 800 °C. The disc measured a C-value of 64 at 1 mA and a nonlinearity exponent n of 37.5.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 7. Unknown: what the silver paint is, and how strong the epoxy solution of the paste is. The spraying is ours, after US Army Corps of Engineers EM 1110-2-3401 (1999). The 10 g batch is our arithmetic. Picture: the patent's drawing.
Lengra kominn
2 days
Leiðbeiningar
1
1
Weigh 99.5 : 0.5 and wet-mill 5 hours
Weigh 99.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide and boric oxide 99.5 : 0.5 by moles. Ours, for 10 g: 9.957 g zinc oxide, 0.043 g boric oxide (our arithmetic). Mill wet for 5 hours, then dry, as in Example 1. Unknown: the milling liquid.
Efni fyrir þetta skref:
Sinkoxíðduft9.957 g
Bóroxíð0.043 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
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 7 gives no thickness.
Nauðsynleg verkfæri:
KísilkarbíðkornSkífmælir5
5
Coat with bismuth and manganese oxide paste, fire at 800 °C
Coat with bismuth and manganese oxide paste, fire at 800 °C
Coat both lapped faces with a paste whose solids are 70 % bismuth oxide and 30 % manganese dioxide by weight, and fire it in air at 800 °C for 30 minutes. Example 7 does not name the paste's liquid; ours: the epoxy-resin butyl-alcohol solution of Example 4. Not given: how much paste.
Efni fyrir þetta skref:
Bismútoxíð1 as required
Mangandíoxíð (pýrólúsít)1 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. Ours, after US Army Corps of Engineers EM 1110-2-3401 (1999): wire-arc spray the aluminium from two 3.2 mm wires melted by an 18-40 V DC arc and atomised by compressed air, 15-20 cm from the disc and never at less than 45°, in at least two coats at right angles of 50-75 µm each. Unknown: the paint.
Efni fyrir þetta skref:
Álhleifur1 as 3.2 mm spray wire
Leiðandi silfurmálning1 as required
Koparvír2 stykkiNauðsynleg verkfæri:
Skífmælir
Ljósbogaúðabyssa
IðnaðarloftþjappaEfni
7- 9.957 gStaðgengill
- 0.043 gStaðgengill
- 1 as requiredStaðgengill
- 1 as requiredStaðgengill
- 1 as 3.2 mm spray wireStaðgengill
- 1 as requiredStaðgengill
- 2 stykkiStaðgengill
Nauðsynleg verkfæri
12- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
- Staðgengill
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.