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Preparation of aluminum nitride powders

1.1 Direct nitriding Aluminum nitride does not exist in nature. It is now prepared by direct nitriding of metallic aluminum powder or direct nitriding method after carbon thermal reduction of Al2O3. Its chemical reaction formula is: 2 al (s) + N2 (g) – > 2 aln (s) Direct nitriding has several advantages: 1) low cost; 2) Rich raw materials; 3) The reaction system is simple and there is no side reaction; 4) The reaction temperature is lower than that of carbothermic reduction; [...]

Synthesis of nano – neodymium oxide by homogeneous precipitation method

Nano Nd_2O_3 powder material was prepared by homogeneous precipitation method. The preparation process, the kinetics of precipitation reaction and thermal decomposition reaction of precursor precipitate were studied. Other lanthanide elements (except promethium) and yttrium oxide were prepared. The main research contents and results are as follows: Nano Nd_2O_3 was prepared by uniform precipitation method by dissolving crude Nd_2O_3 in concentrated nitric acid (Nd(NO_3)_3) and urea as precipitator. The effects of the concentration of Nd~(3+), urea concentration, reaction temperature and [...]

A preparation method and process of nano-holmium oxide

The main uses of holmium oxide are :(1) yttrium aluminum garnet doped with holmium (Ho∶YAG) can emit 2μm laser, human tissues to 2μm laser absorption rate is high, almost 3 orders of magnitude higher than Hd∶YAG. Therefore, the Ho∶YAG laser can not only improve the efficiency and precision of surgery, but also reduce the thermal damage area to a smaller extent. (2) A small amount of holmium can also be added to the magnetostrictive alloy Terfenol-D to reduce the [...]

Discussion on the properties of aluminum nitride

Aluminum nitride (AlN) is a kind of advanced ceramic material with excellent comprehensive performance. It is a kind of new packaging material which is favored by domestic and foreign experts. It is also recognized as the most promising high thermal conductivity ceramic material at present. Research on it began more than a century ago, but it was only used as a nitrogen-fixing fertilizer. As a covalent compound, aluminum nitride is difficult to be sintered due to its high melting [...]

Manufacturing method of nano cobalt oxide

For the gradual maturity and stability of nanotechnology required nano-level items are also more and more, but for nano-level cobalt oxide should be how to make it, with the xiaobian take a look! (1) Preparation of cobalt salt solution: use nitric acid or sulfuric acid to dissolve cobalt metal to generate cobalt nitrate or cobalt sulfate aqueous solution after measuring the cobalt content in the solution of 50~ 300 g/l and free acid control in 20 g/l or less can [...]

Nano tantalum oxide used in radiotherapy and chemotherapy

Today, cancer remains one of the world’s deadliest diseases, with more than 10 million new cases diagnosed each year. The main cancer treatment methods including surgery, chemotherapy and radiotherapy have been widely used in clinical practice, but they all have their own defects. For example, the toxic side effects of chemotherapy and the low absorption efficiency of radiation at the tumor site. Chemo-radiotherapy (radiotherapy) has been widely used in clinical trials in recent years, and a large number of [...]

Capacitor characteristics and application of niobium oxide

In recent years, new oxide solid acids have been reported, among which the fifth subgroup element (V, Nb, Ta) has always been the focus of solid acid research, the industry collectively referred to niobium pentoxide and tantalum pentoxide as soil acids. Hydrate tantalum oxide (Ta2O5) and niobium oxide (Nb2O5) were both potential solid acid catalysts with excellent properties. Niobium has very important research value, so we make a systematic overview of niobium and its compounds first. Niobium and oxygen can [...]

Preparation method and process of lanthanum acetyl acetonate

China is rich in rare earth resources and has the largest reserves in the world. Acetylacetone rare earth complexes have wide application prospects in new luminescent materials, extraction chemistry, displacement reagents, especially stabilizers for plastic processing. In the past, the production process of lanthanum acetyl acetonate adopts solution precipitation method and solution extraction method. These two methods not only consume solvent, but also affect the yield and the performance of the functional complex. In the actual production process, it is [...]

The invention relates to nano praseodymium oxide lubricating oil additive

The technical problem to be solved by the invention is to provide an energy saving and environmental protection rare earth lubricating oil additive. The rare earth lubricant additive has good wear resistance and self – healing properties. In order to solve the above technical problems, the invention provides a nano praseodymium oxide lubricating oil additive, which is characterized in that it contains nano praseodymium oxide after surface modification. Preferably, the lubricating oil additive preparation materials include: Nano praseodymium oxide 15wt. %; Surfactants 85wt. [...]

Application and market demand of cobalt oxide

1. Refined petroleum catalyst Cobalt products have a long history as catalysts for petroleum refining and play an important role in promoting the development of petroleum refining. If there are some metal cobalt, aluminum, iron alloy catalyst; Cobalt oxide is also important as a catalyst for petroleum, which is indispensable for accelerating petroleum refining. Therefore, the use of cobalt oxide catalysts has become an important position in recent years. 2. Battery industry Cobalt powder has been widely used in rechargeable batteries since [...]