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Metal Oxide Varistor: Zinc Oxide with Manganese and Boric Oxides, Bismuth Paste Fired On (Masuyama 1972, Ex. 6)
A varistor with manganese dioxide and boric oxide mixed into the zinc oxide, and bismuth oxide fired on from a paste: 99.0 % zinc oxide, 0.5 % manganese dioxide and 0.5 % boric oxide by moles, sintered at 1350 °C, coated with bismuth oxide paste and fired at 800 °C. The disc measured a C-value of 130 at 1 mA and a nonlinearity exponent n of 29.5.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 6. 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.
고급
2 days
안내
1
1
Weigh 99 : 0.5 : 0.5 and wet-mill 5 hours
Weigh 99 : 0.5 : 0.5 and wet-mill 5 hours
Mix zinc oxide, manganese dioxide and boric oxide 99 : 0.5 : 0.5 by moles. Ours, for 10 g: 9.904 g zinc oxide, 0.053 g manganese dioxide, 0.043 g boric oxide (our arithmetic). Mill wet for 5 hours, then dry, as in Example 1. Unknown: the milling liquid.
이 단계의 재료:
산화아연 분말9.904 g
이산화망가니즈 (연망가니즈석)0.053 g
산화 붕소0.043 g필요한 도구:
접시 저울
철 볼 밀
건조 가마2
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.
필요한 도구:
유압 프레스
원판 압축 금형
버니어 캘리퍼스3
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.
필요한 도구:
머플로4
4
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 6 gives no thickness.
필요한 도구:
탄화규소 연마입자버니어 캘리퍼스5
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.
이 단계의 재료:
산화 비스무트1 as required필요한 도구:
에폭시 수지
n-뷰탄올머플로6
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.
이 단계의 재료:
알루미늄 잉곳1 as 3.2 mm spray wire
은 도전성 도료1 as required
구리선2 개필요한 도구:
버니어 캘리퍼스
아크 용사 건
산업용 공기 압축기재료
7- 9.904 g플레이스홀더
- 0.053 g플레이스홀더
- 0.043 g플레이스홀더
- 1 as required플레이스홀더
- 1 as 3.2 mm spray wire플레이스홀더
- 1 as required플레이스홀더
- 2 개플레이스홀더
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