SENI
KECANTIKAN & KESEHATAN
KERAJINAN
BUDAYA & SEJARAH
HIBURAN
LINGKUNGAN
MAKANAN & MINUMAN
REKAYASA BALIK
ILMU PENGETAHUAN
OLAHRAGA
TEKNOLOGI
PERANGKAT PAKAI
Metal Oxide Varistor: Pure Zinc Oxide at 1350 °C, Bismuth Oxide Paste Fired at 800 °C (Masuyama 1972, Ex. 4)
A varistor made the other way round: a disc of pure zinc oxide, sintered, with bismuth oxide fired into its faces from a paste instead of mixed in. Sintered at 1350 °C and fired with the paste at 800 °C, the disc measured a C-value of 90 at 1 mA and a nonlinearity exponent n of 7.3. Masuyama found that firing on the bismuth oxide paste raises n a great deal over mixing it in.
Source: T. Masuyama, M. Matsuoka and T. Nishi (Matsushita), US 3,663,458 (1972), Example 4. Unknown: how the aluminium is sprayed on, what the silver paint is, and how strong the epoxy solution of the paste is. The 10 g batch is our arithmetic. Picture: the patent's drawing.
Lanjutan
2 days
Instruksi
1
1
Press pure zinc oxide at 340 kg/cm²
Press pure zinc oxide at 340 kg/cm²
Press zinc oxide powder at 340 kg/cm². Example 4 gives no disc size; ours: discs 13 mm across and 2.5 mm thick in the mould of Example 1.
Material untuk langkah ini:
Serbuk Seng Oksida1 as requiredAlat yang dibutuhkan:
Neraca lengan
Mesin pres hidrolik
Cetakan press cakram
Jangka Sorong Vernier2
2
Sinter 1 hour at 1350 °C and cool
Sinter 1 hour at 1350 °C and cool
Heat the pressed disc for 1 hour at 1350 °C, then let it cool to room temperature.
Alat yang dibutuhkan:
Tungku Muffle3
3
Lap both faces
Lap both faces
Lap both faces with silicon carbide abrasive. Example 4 gives no thickness.
Alat yang dibutuhkan:
Butiran silikon karbidaJangka Sorong Vernier4
4
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.
Material untuk langkah ini:
Bismut oksida1 as requiredAlat yang dibutuhkan:
Resin epoksi
n-ButanolTungku Muffle5
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, as in Example 1. Unknown: the spraying method and the paint.
Material untuk langkah ini:
Batangan aluminium1 as required
Cat perak penghantar listrik1 as required
Kawat Tembaga2 buahAlat yang dibutuhkan:
Metode semprot logam yang tidak diketahuiJangka Sorong VernierBahan
5- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 2 buahPlaceholder
Alat yang Diperlukan
9- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
Cetak biru ini membuat
Blueprint terkait
Blueprint ini berbagi pengetahuan — teknik, bahan, atau prinsip
CC0 Domain Publik
Cetak biru ini dirilis di bawah CC0. Anda bebas untuk menyalin, memodifikasi, mendistribusikan, dan menggunakan karya ini untuk tujuan apa pun, termasuk komersial, tanpa meminta izin.
Dukung Maker dengan membeli produk melalui Cetak Biru mereka di mana mereka mendapatkan Komisi Pembuat yang ditetapkan oleh Penjual, atau buat iterasi baru dari Cetak Biru ini dan masukkan sebagai koneksi di milik Anda sendiri.