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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 and calcium nitride powder, can solve the problems of expensive raw materials and achieve low cost, high conversion rate and good filling performance

Active Publication Date: 2013-08-21
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] Weigh 1000 grams of metal calcium powder (accounting for 50% of the total weight of the raw materials) according to the weight ratio. The metal calcium powder particles are 100 meshes and have a purity of >99%; weigh 800 grams of calcium nitride powder (accounting for the total weight of the raw materials). 40%), the average particle size of the calcium nitride powder is 20μm, and the purity is >98%; weigh ammonium carbonate (NH 4 ) 2 CO 3 200 grams (10% of the total weight of the raw materials). After mixing, use silicon nitride (chemical formula: Si3N4) balls as the ball milling medium. The diameter of the silicon nitride balls is 20 mm. They are placed in an 8-liter polyurethane tank. The weight ratio of the silicon nitride grinding balls is 1:10, and they are placed on the tank mill for dry ball milling for 1 hour. The tank mill in this example is produced by Zibo Qixingxing New Materials Co., Ltd. GM8, which is mechanized for dry mixing and mixing. The uniformly mix...

Embodiment 2

[0037] Weigh 600 grams of metal calcium powder (accounting for 30% of the total weight of the raw materials) according to the weight ratio. The metal calcium powder particles are 600 meshes and have a purity of >95%; weigh 1000 grams of calcium nitride powder (accounting for the total weight of the raw materials). 50%), the average particle size of the calcium nitride powder is 20μm, and the purity is >98%; weigh 400 grams of ammonium chloride (NH 4 ) 2 Cl (20% of the total weight of the raw materials). After mixing, use alumina balls with a diameter of 10 mm as the ball milling medium and place them in a polyurethane tank. The weight ratio of the above-mentioned raw materials to alumina balls is 1:10. Ball mill on the machine for 4 hours, the mixed materials are passed through a 60-mesh screen, and the sieved materials are evenly placed in a porous semi-cylindrical graphite boat, and then put into the spontaneous combustion synthesis reactor, after evacuating to 600Pa , Filled ...

Embodiment 3

[0040] Weigh 900 grams of metal calcium powder (accounting for 45% of the total weight of the raw materials) according to the weight ratio. The metal calcium powder particles are 240 meshes and have a purity of >97%; weigh 700 grams of calcium nitride powder (accounting for the total weight of the raw materials). 35%), the average particle size of the calcium nitride powder is 10μm, and the purity>98%; weigh 400 grams of urea CO(NH 2 ) 2 (Accounting for 20% of the total weight of the raw materials), after mixing, use zirconia balls with a diameter of 5 mm as the ball milling medium, and place them in a polyurethane tank. The weight ratio of the above raw materials to zirconia balls is 1:8 and placed on the tank mill. After ball milling for 3 hours, the uniformly mixed materials are passed through a 60-mesh screen, and the sieved materials are evenly placed in a porous semi-cylindrical graphite boat, and then placed in the spontaneous combustion synthesis reactor, after evacuating...

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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 )The 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 phase reaction of preparing many new materials with excellent properties (such as boron nitride and silicon nitride), calcium nitride is indispensable The sintering aids, such as calcium nitride under high temperature and pressure, can promote the conversion of hexagonal boron nitride to cubic boron nitride. Calcium nitride can also be used to prepare special ceramic materials and special glasses, as well as additives for high-strength steel smelting. At the same ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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