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Method for producing calcium nitride powder

A technology of calcium nitride powder and calcium metal, which is applied in the production of calcium nitride powder and the field of calcium nitride production, can solve the problems of expensive raw materials, achieve low cost, stable performance, and reduce production costs

Active Publication Date: 2012-04-18
烟台同立高科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent literature (CN1665744A) discloses that Francois Lacoste of France adopts the zinc-calcium alloy of droplet to make calcium nitride in nitrogen environment, and the raw material that this method adopts is expensive, and the prepared powder contains A small amount of zinc impurity

Method used

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  • Method for producing calcium nitride powder
  • Method for producing calcium nitride powder
  • Method for producing calcium nitride powder

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take by weighing 1000 grams of calcium metal powder (accounting for 50% of the total weight of raw materials) by weight, and the particles of calcium metal powder are 100 orders, with a purity>99%; 800 grams of calcium nitride powder (accounting for 50% of the total weight of raw materials) 40%), the calcium nitride powder has an average particle size of 20 μm and a purity of >98%; weigh ammonium carbonate (NH 4 ) 2 CO 3 200 grams (accounting for 10% of raw material gross weight), after mixing, with silicon nitride (chemical formula: Si3N4) ball is ball milling medium, and silicon nitride ball diameter is 20 millimeters, is placed in the polyurethane tank of 8 liters, above-mentioned raw material and The weight ratio of the silicon nitride grinding balls is 1:10, and they are placed on a pot mill for dry ball milling for 1 hour. The pot mill in this embodiment is produced by GM8 from Zibo Qimingxing New Material Co., Ltd., and the mechanized dry mixing is carried out....

Embodiment 2

[0037]Take by weighing 600 grams of calcium metal powder (accounting for 30% of gross raw material weight) by weight ratio, this metallic calcium powder particle is 600 orders, purity>95%; Take by weighing 1000 grams of calcium nitride powder (accounting for 30% of raw material gross weight) 50%), the average particle size of the calcium nitride powder is 20 μm, and the purity is >98%; 400 grams of ammonium chloride (NH 4 ) 2 Cl (accounting for 20% of the total weight of the raw materials), after mixing, the aluminum oxide balls with a diameter of 10 mm are used as the ball milling medium and placed in a polyurethane tank. Ball mill on the machine for 4 hours, and the evenly mixed material passes through a 60-mesh sieve, and the sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then put into a self-propagating synthesis reactor, and then vacuumed to 600Pa , filled with 4MPa high-purity nitrogen, using a tungsten wire with a diameter of 0.6 mm as...

Embodiment 3

[0040] Take by weight 900 grams of calcium metal powder (accounting for 45% of the total weight of raw materials), the calcium metal powder particles are 240 orders, purity>97%; take by weighing 700 grams of calcium nitride powder (accounting for 45% of the total weight of raw materials) 35%), the average particle size of the calcium nitride powder is 10 μm, and the purity is >98%; 400 grams of urea CO (NH 2 ) 2 (accounting for 20% of the total weight of the raw materials), after mixing, the zirconia balls with a diameter of 5 mm are used as the ball milling medium, placed in a polyurethane tank, and the weight ratio of the above-mentioned raw materials to the zirconia balls is 1:8, and placed on a tank mill Ball mill for 3 hours, and the uniformly mixed material passes through a 60-mesh sieve. The sieved material is evenly placed in a porous semi-cylindrical graphite boat, and then placed in a self-propagating synthesis reactor. After vacuuming to 600Pa, Fill with 6MPa high-...

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Abstract

The invention discloses a method for producing calcium nitride powder. The method comprises the following steps: adding the following components by weight percent: 30-50% of metal calcium powder, 30-50% of diluting agent and 10-20% of additive, wherein the metal calcium powder is used as a raw material; placing a proportioned mixture in a polyurethane tank to carry out ball milling for 1-4 hours, and sieving with a screen after ball milling; putting the mixture powder in a graphite boat, and then placing the graphite boat in a self-propagating reactor; vacuumizing to 400-600 Pa, and then introducing nitrogen, maintaining the pressure in the self-propagating reactor to be 4-8MPa, igniting and carrying out self-propagating synthesis; and when the pressure in the self-propagating reactor is reduced to 4-8MPa, finishing the self-propagating reaction, releasing the gas in the reactor, and then introducing nitrogen to the self-propagating reactor for 1-5 minutes, and opening the reactor so as to obtain the calcium nitride powder finished product. The calcium nitride powder prepared by using the method disclosed by the invention has wide raw material resources, high phase content and high purity; the method disclosed by the invention has simple and reliable process; and by using the method, energy is saved.

Description

technical field [0001] The invention relates to a method for producing calcium nitride, in particular to a method for producing calcium nitride powder, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Calcium Nitride (Ca 3 N 2 ) powder is a brown powder with a density of 2.63g / cm 3 (17°C), melting point 1195°C, ionic compound. Calcium nitride can be widely used in the fields of semiconductor materials, fine ceramics and high-end refractory materials. In the solid-state reaction of many new materials with excellent properties (such as boron nitride and silicon nitride), calcium nitride is indispensable. Sintering aids such as calcium nitride can promote the conversion of hexagonal boron nitride to cubic boron nitride at high temperature and pressure. Calcium nitride can also be used to prepare special ceramic materials and special glass, and can also be used as an additive for high-strength steel smelting. At the same ...

Claims

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Application Information

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IPC IPC(8): C01B21/06
Inventor 郭大为陈晓光孙洪亮
Owner 烟台同立高科新材料股份有限公司
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