Ukusebenzisana
UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
English
Metal Oxide Varistor: Zinc Oxide with 0.5 % Antimony Trioxide, 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 % antimony trioxide 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 140 at 1 mA and a nonlinearity exponent n of 40.8.
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.
Osezingeni eliphezulu
2 days
Imiyalelo
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 antimony trioxide 99.5 : 0.5 by moles. Ours, for 10 g: 9.823 g zinc oxide, 0.177 g antimony trioxide (our arithmetic). Mill wet for 5 hours, then dry, as in Example 1. Unknown: the milling liquid.
Izinto zokwakha zalesi sinyathelo:
Impuphu Ye-Zinc Oxide9.823 g
I-antimony trioxide0.177 gAmathuluzi adingekayo:
Isikali sesilinganiso
Umshini Wokugaya Ngamabhola Ensimbi
Ihhavini yokomisa2
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.
Amathuluzi adingekayo:
Umshini wokucindezela we-hydraulic
Isikhunta sokucindezela idiski
I-Vernier Caliper3
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.
Amathuluzi adingekayo:
Isithando se-muffle4
4
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 7 gives no thickness.
Amathuluzi adingekayo:
Amagcubu e-silicon carbideI-Vernier Caliper5
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.
Izinto zokwakha zalesi sinyathelo:
I-bismuth oxide1 as required
I-manganese dioxide (i-pyrolusite)1 as requiredAmathuluzi adingekayo:
I-epoxy resin
I-n-ButanolIsithando se-muffle6
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.
Izinto zokwakha zalesi sinyathelo:
Isigaxa se-aluminium1 as 3.2 mm spray wire
Upende wesiliva odlulisa ugesi1 as required
Ucingo Lwethusi2 izicucuAmathuluzi adingekayo:
I-Vernier Caliper
Isibhamu sokufafaza nge-arc yocingo
Umcindezeli womoya wezimboniIzinto
7- 9.823 gIsibambeli
- 0.177 gIsibambeli
- 1 as requiredIsibambeli
- 1 as requiredIsibambeli
- 1 as 3.2 mm spray wireIsibambeli
- 1 as requiredIsibambeli
- 2 izicucuIsibambeli
Amathuluzi Adingekayo
12- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
Ama-blueprint ahlobene
Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso
Metal Oxide Varistor: Zinc Oxide with 0.2 % Bismuth Oxide, Sintered Disc (Masuyama 1972)
ngu-Ed
Kwezimboni
5
0
0
0
0
0
Metal Oxide Varistor: Pure Zinc Oxide at 1350 °C, Bismuth Oxide Paste Fired at 800 °C (Masuyama 1972, Ex. 4)
ngu-Ed
Kwezimboni
5
0
0
0
0
0
Antimony Trioxide: Roasted Antimony Fused with More Metal (Thorpe 1912)
ngu-Charlie
Kwezimboni
14
0
0
0
0
0
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