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关于云母绝缘材料的三个问题------选自中国粉体网

491
发表时间:2017-07-05 17:26

[导读] 日前有报道称通城长丰云母绝缘材料即将投产,总投资6000万元。而关于云母绝缘材料你知多少?

[Takeaway] has reportedly changfeng city mica insulation material is put into production, with a total investment of 60 million yuan.How much do you know about mica insulation?

中国粉体网讯  日前有报道称通城长丰云母绝缘材料即将投产,总投资6000万元。武汉长丰绝缘材料有限公司位于关刀镇关刀村五组,占地面积9000平方米。该公司计划总投资6000万元,第一期于2016年8月动工兴建,目前已建成生产车间三栋,面积3500平方米,新上云母绝缘生产线3条。关于云母绝缘材料你知多少?

China powder webex Recently there have been reports changfeng city mica insulation material is put into production, with a total investment of 60 million yuan.Wuhan changfeng insulation materials co., LTD is located in the town of guan dao guan dao village five groups, covers an area of 9000 square meters.The company plans a total investment of 60 million yuan, the first phase of construction in August 2016, now has built three production workshop, covering an area of 3500 square meters, 3 mica insulation on the new production lines.How much do you know about mica insulation materials?



金属导体,富含多种金属的云母为何可作绝缘材料?


云母是富含钾、铝、镁、铁、锂等金属的硅酸盐矿物。金属是导体的,为什么很多的导体加一起就绝缘了呢?


云母是良好的绝缘材料,因为这些金属元素不是以单体存在于云母中的,是以价键形式存在的,可以理解为一种类似于氧化物状态的存在,云母不溶于水,其金属离子也不容易电离于水中,所以说云母是绝缘的。


如何判断云母绝缘性能?


云母属于层状结构硅酸盐矿物,具有连续层状硅氧四面体构造,是一类很常见的造岩矿物,分三个亚类:白云母、黑云母和锂云母。它具有很高的电绝缘强度、耐电晕、耐热以及良好的力学性能,被广泛用作电子、电力工业上的绝缘材料。


云母的颜色特征通常可用来判断其绝缘性能,工业云母一般以浅色为好。白云母和金云母具有良好的电绝缘性和不导热、抗酸、抗碱和耐压性能,而黑云母的绝缘性能非常差。


制备云母绝缘材料的原材料有哪些?


云母绝缘材料主要由3部分组成:介电材料、补强材料和 粘结剂。作为绝缘材料用的云母必须具备含铁量低、表面平滑、无 波纹皱痕、不含有包裹体等条件,因此用于电气绝缘的主要为白云母、金云母和合成云母。


白云母的特性是绝缘、耐高温、有光泽、物理化学性能稳定,具有良好的隔热性、弹性和韧性。工业上主要利用它的绝缘性和耐热性,以及抗酸、抗碱性、抗压和剥分性,用作电气设备和电工器材的绝缘材料。


金云母外观呈浅绿、浅褐、浅黄或橙黄色,具有玻璃光泽或半金属光泽。金云母作绝缘材料对铁的含量要求较严格,不能太多。浅色金云母耐热温度高,可在1000℃以下用作绝缘材料。


合成云母类似于金云母,但具有更高的结晶稳定性,最高使用温度可达1100℃,但由于工业化生产困难和价格方面原因,在电工行业的生产应用还比较少。


在工业生产中,作为原料的首先是薄片云母,但随着云母用量的增加,开始逐渐被整体性好、电气强度高,可使电机绝缘厚度减薄的粉云母纸所替代。云母碎和云母粉可以加工成云母纸,也可代替云母片制造各种成本低廉、厚度均匀的绝缘材料。


粘结剂在云母制品中起着将片云母或粉云母纸粘附于补强材料,使之成为一体的作用。粘结剂除了决定云母制品的电气力学性能之外,还决定云母制品的耐热性能。不同的云母制品,对粘结剂有着特殊的要求。云母带、柔软云母板用的粘结剂应具有良好的柔软性和热弹性,如醇酸云母胶、环氧云母胶。换向器云母板或衬垫云母板用的粘结剂,固化后要有一定的硬度和耐磨性,如聚氨酰亚氨胶。而塑型云母板或云母箔的粘结剂,需要一定的热塑性。耐热云母制品用粘结剂必须具有相应的耐热等级,如桐马酸酐环氧云母胶。



近年来,随着大、中型高压电机向大容量、高参数不断发展,对云母制品绝缘水平的要求也越来越高。大、中型高压电机绝缘总的发展趋势是要求云母绝缘材料向高性能、高耐热等级、减薄绝缘厚度和低成本等几个方向发展,这就要求提高云母含量、热态机械强度和耐电热老化寿命,并不断改进绝缘工艺性。

--------选自中国粉体网

Metal conductor, rich in a variety of metal of mica why can make insulation material?

Mica is rich in potassium, with metals such as aluminum, magnesium, iron, lithium silicate minerals.Metals are conductors, why a lot of added together is insulated conductors?

Mica is a good insulating material, because the metal element is not exist in monomer in the mica, exists in the form of valence bond, can be understood as the existence of a state is similar to the oxide, mica insoluble in water, the metal ion is not easy to ionization in the water, so said mica insulation.

How to judge mica insulation?

Mica belongs to the layered structure silicate minerals, with continuous layered silicon oxygen tetrahedron structure, is a kind of very common rock forming minerals, divided into three types: Muscovite, biotite and lithium mica.It has a high electrical insulating strength, corona resistance, heat resistance and good mechanical properties, are widely used as insulation materials on the electronics, electric power industry.

Mica color features are usually available to determine its insulation performance, industrial mica general with light color as well.Muscovite and phlogopite has good electrical insulation and thermal conductivity, acid resistance, alkali resistance and pressure resistance, and black mica insulation performance is very poor.

What are the raw materials preparation of mica insulation materials?

Mica insulation materials mainly consists of three parts: dielectric materials, reinforcement materials and binder.As of mica insulation materials must have low iron content, surface smooth, without a ripple wrinkles, does not contain inclusions, such as conditions, therefore used for electrical insulation are mainly white mica, phlogopite and synthetic mica.

Are the characteristics of white mica insulation, high temperature resistant, luster, physical and chemical performance is stable, has a good thermal insulation, elasticity and toughness.Industry mainly USES its insulation and heat resistance, and acid resistance, alkali resistance, compressive strength and peeling and used for electrical equipment and electrical equipment insulation.

Appearance of phlogopite is shallow green, shallow brown, pale yellow or orange, with glass luster or half metallic luster.Phlogopite insulated material is strict with the content of iron, not too much.Light color phlogopite heat resistant high temperature, can be under 1000 ℃ used for insulation.

Synthetic mica is similar to phlogopite, but has higher crystallization stability, the highest temperature can reach 1100 ℃, but due to industrial production difficulties and the price, in the production of electrical industry application is also less.

In industrial production, as the raw material is first sheet mica, but with the increase of dosage of mica, begin to be good integrity, high dielectric strength, can make the powder of motor insulation thickness thinning mica paper.Mica and mica powder can be processed into mica paper, also can make various low cost, instead of mica sheet thickness of insulating materials.

Binder in mica products will play a piece of mica powder or mica paper adhesion in reinforcing material, making it one of the function.Binder besides decided to electrical and mechanical performance of mica products, also decided to heat resistant properties of mica products.Different mica products, has special requirements for binder.Soft mica tape, mica plate with binder should have good softness and thermal elasticity, such as alkyd mica rubber, epoxy mica rubber.Commutator mica plate or liner mica plate with adhesive, after curing have a certain hardness and abrasion resistance, such as poly (ammonia acyl imide glue.Shape mica plate and mica foil adhesive, needs certain thermoplastic.Heat-resistant mica products with adhesive must have the corresponding temperature classification, such as epoxy mica tung horse anhydride adhesive.

In recent years, with large and medium-sized high-voltage motors to development the large capacity and high parameter, more and more is also high to the requirement of mica products insulation level.Large and medium-sized high-voltage electrical insulation the general development trend of mica insulation materials to high performance, high temperature classification, thinned insulation thickness and low cost direction, which requires the mica content, mechanical strength and resistance to thermal state electric heat aging life, and constantly improve the insulation manufacturability.

-- -- -- -- -- -- -- -- from China powder network


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