艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
Strontium Ferrite Disc Magnet: Presintered at 1100 °C, 0.1 mol SrCO3 to 0.7 mol Iron Oxide (Went, Philips 1956, Ex. 8)
A strontium ferrite: 0.1 mol strontium carbonate to 0.7 mol iron oxide, dried, milled, presintered 3.5 hours at 1100 °C, bound, formed and passed through a 1280 °C furnace in 10 minutes. Went's rod held 1,535 gauss with a coercive force of 2,800 oersted.
Source: J. J. Went, G. W. van Oosterhout and E. W. Gorter (Philips), US 2,762,777 (1956), Example 8. They sintered rods; discs and the magnetising are ours. Picture: ferrite magnets, Omegatron, Wikimedia Commons, CC BY-SA 3.0.
高级
2 days
说明
1
1
Weigh strontium carbonate and iron oxide
Weigh strontium carbonate and iron oxide
Weigh 14.8 g strontium carbonate (0.1 mol) and 112.1 g ferric oxide (0.7 mol).
此步骤所需材料：
碳酸锶14.8 克
氧化铁112.1 克所需工具：
等臂天平
P100 防毒面具2
2
Dry at 200 °C, mill with alcohol 4 hours
Dry at 200 °C, mill with alcohol 4 hours
Dry the mixture at 200 °C, then grind it with alcohol in a ball mill for 4 hours and dry it.
所需工具：
干燥炉
铁球磨机
乙醇——实验级，95 %3
3
Presinter in air at 1100 °C for 3.5 hours
Presinter in air at 1100 °C for 3.5 hours
Fire the powder in air at 1100 °C for about 3.5 hours.
所需工具：
马弗炉
带盖坩埚（瓷质）
坩埚钳
耐热手套4
4
Add a binder and form, dry overnight
Add a binder and form, dry overnight
Add a binder as in Example 1 (polyvinyl alcohol or nitrocellulose). The patent extrudes rods; ours: press discs at 1.5 tonnes per cm². Dry overnight.
所需工具：
聚乙烯醇粉末
液压机
圆片压模干燥炉5
5
Pass through a 1280 °C zone in 10 minutes
Pass through a 1280 °C zone in 10 minutes
Sinter in air at 1280 °C by passing the pieces through a 10 cm hot zone at 10 mm per minute: 10 minutes in the heat.
所需工具：
管式炉耐热手套6
6
Magnetise the discs
Magnetise the discs
The patent gives no magnetising method. Ours: lay a disc with its faces against the poles of a strong electromagnet, switch the current on, then off. Find which face is north with a compass.
所需工具：
电磁铁
指南针此蓝图制作
相关蓝图
这些蓝图共享知识——技术、材料或原理
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。