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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: 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 : 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.
이 단계의 재료:
산화아연 분말9.875 g
알루미나 분말(산화알루미늄)0.125 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
As in Example 2: 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 5 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
6- 9.875 g플레이스홀더
- 0.125 g플레이스홀더
- 1 as required플레이스홀더
- 1 as 3.2 mm spray wire플레이스홀더
- 1 as required플레이스홀더
- 2 개플레이스홀더
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관련 블루프린트
이 블루프린트들은 지식을 공유합니다 — 기술, 재료 또는 원리
CC0 퍼블릭 도메인
이 블루프린트는 CC0로 공개되었습니다. 어떤 목적으로든 자유롭게 복사, 수정, 배포 및 사용할 수 있습니다.
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