磁铁/磁石不属于稀土吧！中国6，70年代就有很多乡镇社办企业，专门加工磁铁

[_notalandlord]

感觉没啥技术含量。美国缺磁铁应该不是加工环节，应该就是地里没有

[xiaoju]

把铁常温放置，就会被地球磁场磁化变成磁铁

感觉没啥技术含量。美国缺磁铁应该不是加工环节，应该就是地里没有

[marclee]

操，磁性材料多了，此磁铁非彼磁铁！

[firecloud]

普通的磁铁就是四氧化三铁吧

稀土永磁材料是将钐、钕混合稀土金属与过渡金属（如钴、铁等）组成的合金，用粉末冶金方法压型烧结，经磁场充磁后制得的一种磁性材料。
稀土永磁分为：钐钴（SmCo）永磁体和钕铁硼（NdFeB）永磁体。其中SmCo磁体的磁能积在15--30MGOe之间，NdFeB系磁体的磁能积在27--50MGOe之间，被称为“永磁王”，是磁性最高的永磁材料。钐钴永磁体，尽管其磁性能优异，但含有储量稀少的稀土金属钐和钴稀缺、昂贵的战略金属钴，因此，它的发展受到了很大的限制。我国稀土永磁行业的发展始于60年代末，当时的主导产品是钐-钴永磁，钐-钴永磁体世界销售量为630吨，我国为90.5吨（包括SmCo磁粉），主要用于军工技术。

[verdelite]

感觉没啥技术含量。美国缺磁铁应该不是加工环节，应该就是地里没有

你那些是低水平的磁铁。
现在的钕铁硼磁铁，得有钕。
钐钴磁铁，得有钐。

[_notalandlord]

把铁常温放置，就会被地球磁场磁化变成磁铁

既然这么简单，那美帝还天天叨叨中国的磁铁干哈

[windy]

我的理解是高磁性的材料要用到稀土。普通磁铁肯定不用。很多东西现在要用到高磁性的材料

[_notalandlord]

你那些是低水平的磁铁。
现在的钕铁硼磁铁，得有钕。
钐钴磁铁，得有钐。

反正就是不卖就完了。芬太尼也不卖，让他们去用吗啡好了。

[magagop]

感觉没啥技术含量。美国缺磁铁应该不是加工环节，应该就是地里没有

小白討論技術前都不做功課嗎？大學沒選無機化學和物理化學？

「Dysprosium is a chemical element; it has symbol Dy and atomic number 66. It is a rare-earth element in the lanthanide series with a metallic silver luster. Dysprosium is never found in nature as a free element, though, like other lanthanides, it is found in various minerals, such as xenotime. Neodymium–iron–boron magnets can have up to 6% of the neodymium substituted by dysprosium to raise the coercivity for demanding applications, such as drive motors for electric vehicles and generators for wind turbines. This substitution would require up to 100 grams of dysprosium per electric car produced. Based on Toyota's projected 2 million units per year, the use of dysprosium in applications such as this would quickly exhaust its available supply. The dysprosium substitution may also be useful in other applications because it improves the corrosion resistance of the magnets. Dysprosium is obtained primarily from monazite sand, a mixture of various phosphates. The metal is obtained as a by-product in the commercial extraction of yttrium. In isolating dysprosium, most of the unwanted metals can be removed magnetically or by a flotation process. Dysprosium can then be separated from other rare earth metals by an ion exchange displacement process. The resulting dysprosium ions can then react with either fluorine or chlorine to form dysprosium fluoride, DyF3, or dysprosium chloride, DyCl3. These compounds can be reduced using either calcium or lithium metals. About 3100 tonnes of dysprosium were produced worldwide in 2021, with 40% of that total produced in China, 31% in Myanmar, and 20% in Australia. Dysprosium prices have climbed over time, from $7 per pound in 2003, to $130 a pound in late 2010, to $1,400/kg in 2011 and then falling to $240/kg in 2015, largely due to illegal production in China which circumvented government restrictions. As of April 2025, the price is around USD$203/kg. Currently, most dysprosium is being obtained from the ion-adsorption clay ores of southern China. As of November 2018 the Browns Range Project pilot plant, 160 km south east of Halls Creek, Western Australia, is producing 50 tonnes (49 long tons) per annum. Neodymium is a chemical element; it has symbol Nd and atomic number 60. It is the fourth member of the lanthanide series and is considered to be one of the rare-earth metals. It is a hard, slightly malleable, silvery metal that quickly tarnishes in air and moisture. When oxidized, neodymium reacts quickly producing pink, purple/blue and yellow compounds in the +2, +3 and +4 oxidation states. It is generally regarded as having one of the most complex spectra of the elements. Most of the world's commercial neodymium is mined in China, as is the case with many other rare-earth metals. Neodymium is rarely found in nature as a free element, instead occurring in ores such as monazite and bastnäsite (which are mineral groups rather than single minerals) that contain small amounts of all rare-earth elements. Neodymium is rarely dominant in these minerals, with exceptions such as monazite-(Nd) and kozoite-(Nd). The main mining areas are in China, United States, Brazil, India, Sri Lanka, and Australia. The world's production of neodymium was about 7,000 tons in 2004. The bulk of current production is from China. Historically, the Chinese government imposed strategic material controls on the element, causing large fluctuations in prices. The uncertainty of pricing and availability have caused companies (particularly Japanese ones) to create permanent magnets and associated electric motors with fewer rare-earth metals; however, so far they have been unable to eliminate the need for neodymium. According to the US Geological Survey, Greenland holds the largest reserves of undeveloped rare-earth deposits, particularly neodymium. Mining interests clash with native populations at those sites, due to the release of radioactive substances, mainly thorium, during the mining process. Neodymium magnets (an alloy, Nd2Fe14B) are the strongest permanent magnets known. A neodymium magnet of a few tens of grams can lift a thousand times its own weight, and can snap together with enough force to break bones. These magnets are cheaper, lighter, and stronger than samarium–cobalt magnets. However, they are not superior in every aspect, as neodymium-based magnets lose their magnetism at lower temperatures and tend to corrode, while samarium–cobalt magnets do not. Neodymium magnets appear in products such as microphones, professional loudspeakers, headphones, guitar and bass guitar pick-ups, and computer hard disks where low mass, small volume, or strong magnetic fields are required. Neodymium is used in the electric motors of hybrid and electric automobiles and in the electricity generators of some designs of commercial wind turbines (only wind turbines with "permanent magnet" generators use neodymium). For example, drive electric motors of each Toyota Prius require one kilogram (2.2 pounds) of neodymium per vehicle. Neodymium magnets are also widely used in pure electric vehicle motors, driving rapid growth in demand.」

[_notalandlord]

以前没觉得磁性材料的。书最近买了这个，感觉里面也用了不少磁性材料。好几个地方都是靠磁性接驳。不用力都扳不下来。

[marclee]

操，淘宝，特木到处在卖高磁性，高到作为危险物品。叔定了好几次都撤了单。

菌斑真他妈无知的人多。

[DavidHuang]

拆开硬盘，取出里面的磁铁玩玩，就知道稀土磁性材料的强大了。

Philips 某些电动牙刷上也用了稀土磁性材料

[verdelite]

我的理解是高磁性的材料要用到稀土。普通磁铁肯定不用。很多东西现在要用到高磁性的材料

我前一阵子拆了个碎纸机。家用的那种。一看其发动机，是励磁的。看着是用交流电的，但是却有碳刷。我想目的是为了它能反转。

其实西方汽车里面用的钕铁硼，都可以重新设计以后取消。大户就是一些电动机。雨刷电动机，有必要用钕铁硼吗？答案是没有。汽车喇叭的磁钢，有必要用钕铁硼吗？答案是没有。可以励磁，也可以用以前的铝镍钴，也可以用以前的铁氧体磁铁。

总之重新设计一下就行了，体积大一点，重量重一点而已。并非除它之后就完蛋了。现在为啥闹成这个样子？答案是厂家懒惰呗，怕重新设计后中国又开放卖了，结果它竞争对手没重新设计省钱了。

[verdelite]

拆开硬盘，取出里面的磁铁玩玩，就知道稀土磁性材料的强大了。

Philips 某些电动牙刷上也用了稀土磁性材料

这些需要体积小的强大磁场的地方，确实得用钕铁硼。但是汽车雨刷电动机和喇叭，用钕铁硼真不是必要的。

[windy]

对。只要不太在乎体积重量外观，不用稀土制成的磁铁完全没问题。我估计有的厂家肯定已经在寻找变通方案了。也不见得是厂家懒惰，本来供应的好好的突然断供，修改设计，找别的供应商按新的设计生产电机也不是一天两天就能搞定的。但我估计以后这些厂家要有备用方案了。

我前一阵子拆了个碎纸机。家用的那种。一看其发动机，是励磁的。看着是用交流电的，但是却有碳刷。我想目的是为了它能反转。

其实西方汽车里面用的钕铁硼，都可以重新设计以后取消。大户就是一些电动机。雨刷电动机，有必要用钕铁硼吗？答案是没有。汽车喇叭的磁钢，有必要用钕铁硼吗？答案是没有。可以励磁，也可以用以前的铝镍钴，也可以用以前的铁氧体磁铁。

总之重新设计一下就行了，体积大一点，重量重一点而已。并非除它之后就完蛋了。现在为啥闹成这个样子？答案是厂家懒惰呗，怕重新设计后中国又开放卖了，结果它竞争对手没重新设计省钱了。

[xiaoju]

非稀土磁铁和稀土磁铁的差别，相当于马车和汽车的差别

对。只要不太在乎体积重量外观，不用稀土制成的磁铁完全没问题。我估计有的厂家肯定已经在寻找变通方案了。也不见得是厂家懒惰，本来供应的好好的突然断供，修改设计，找别的供应商按新的设计生产电机也不是一天两天就能搞定的。但我估计以后这些厂家要有备用方案了。

[xiaoju]

你弟车厂停产不是因为缺雨刷器和喇叭

这些需要体积小的强大磁场的地方，确实得用钕铁硼。但是汽车雨刷电动机和喇叭，用钕铁硼真不是必要的。

[xiaoju]

磁力不够啊

既然这么简单，那美帝还天天叨叨中国的磁铁干哈

[verdelite]

你弟车厂停产不是因为缺雨刷器和喇叭

至少那啥车厂CEO是这样说的。

[xiaoju]

我看可以

美国少年把4杯25度的水倒在一起，就有了100度开水

我前一阵子拆了个碎纸机。家用的那种。一看其发动机，是励磁的。看着是用交流电的，但是却有碳刷。我想目的是为了它能反转。

其实西方汽车里面用的钕铁硼，都可以重新设计以后取消。大户就是一些电动机。雨刷电动机，有必要用钕铁硼吗？答案是没有。汽车喇叭的磁钢，有必要用钕铁硼吗？答案是没有。可以励磁，也可以用以前的铝镍钴，也可以用以前的铁氧体磁铁。

总之重新设计一下就行了，体积大一点，重量重一点而已。并非除它之后就完蛋了。现在为啥闹成这个样子？答案是厂家懒惰呗，怕重新设计后中国又开放卖了，结果它竞争对手没重新设计省钱了。