Zirconium boride and method for producing same

A technology of zirconium boride and zirconia, applied in the field of combustible zirconium boride and its preparation, can solve the problems of poor material stability and less heat, and achieve the effect of excellent material stability and increased heat

Active Publication Date: 2018-07-31
DAIICHI KIGENSO KAGAKU KOGYO CO LTD
View PDF11 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these metal powders have problems such as low heat during combustion and poor material stability.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Zirconium boride and method for producing same
  • Zirconium boride and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] 2. Preparation method of zirconium boride

[0049] The preparation method of the zirconium boride of the present invention has the following steps 1-4.

[0050] (1) Step 1: mixing zirconia, boria and carbon so that the mass ratio of boron oxide to zirconia in the mixture is 90-120% by mass, and the mass ratio of carbon to zirconia is 40-60% by mass;

[0051] (2) Step 2: firing the mixture obtained in step 1 at 400°C to 600°C;

[0052] (3) Step 3: Melting the sintered granules obtained in the step 2 at a temperature above the melting point of zirconium boride through an argon plasma arc in a reducing atmosphere formed by argon;

[0053] (4) Step 4: Slowly cooling the melt obtained in Step 3 to obtain an ingot of zirconium boride.

[0054] Since easily synthesized zirconia and inexpensively obtained boron oxide and carbon are used as raw materials, the method for producing zirconium boride of the present invention can be produced at low cost and can obtain zirconium b...

Embodiment 1）

[0101] For zirconia, powder with a purity of 99.5% by mass and an average particle size of 3 μm (manufactured by Daiichi Zenen Chemical Industry Co., Ltd.), fine powder SGP (manufactured by SEC Carbon Co., Ltd.) for carbon, and B made by BORAX for boron oxide 2 o 3 of powder.

[0102] First, 3.8 kg of zirconia powder, 1.9 kg of carbon powder, and 4.3 kg of boron oxide powder were weighed separately, and they were mixed for 30 minutes with a V-type mixer.

[0103] Thereafter, the obtained mixture was calcined at 480° C. for 3 hours to obtain a sintered granulated product.

[0104] Next, the obtained sintered granules were spread over the electric melting furnace, and electricity was applied while flowing argon gas for generating argon plasma at 0.03 MPa. Electricity is applied at 100 kwh for 1.5 hours to melt at or above the melting point of zirconium boride (unit power consumption: 15 kwh / kg). After the melting was completed, the inflow of argon gas was stopped, a carbon co...

Embodiment 2）

[0109] The ingot obtained in Example 1 was further pulverized with a planetary mill to obtain a powder with an average particle diameter of 1.0 μm. Carbon content is 5.8%, S.A. is 20.6 m 2 / g.

[0110] Potassium perchlorate was added to the obtained zirconium boride powder at a ratio of 40%, mixed well, and 8.1 mg of the obtained mixed powder was subjected to DTA measurement at a temperature increase of 5° C. / m.

[0111] As a result, in the TG-DTA curve, the exothermic peak appeared near 500~550℃, and the exothermic heat seen from the peak was 315.6 μV. Based on this value, the heat release per unit weight is calculated to be 315.6 / 8.1 = 39.0 μV / mg.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Login to view more

Abstract

The purpose of the present invention is to provide zirconium boride which can produce a large amount of heat upon the combustion in the presence of a compound having radical, e.g., a perchloric salt,can combust within a short time and has high substance stability. In order to provide the zirconium boride, the amount of lattice-defect-derived radical, which is detected by ESR measurement of zirconium boride, is adjusted to 0.1*10^15 spin / mg or more.

Description

technical field [0001] The present invention relates to flammable zirconium boride and its preparation method. Background technique [0002] Generally, metal powders such as metal zirconium and zirconium carbide are known to burn in a short time by mixing with perchlorate. For example, according to Patent Document 1, metallic zirconium powder is used as an ignition agent for an airbag inflator. However, these metal powders have problems such as low calorific value during combustion and poor material stability. There is a need to find metal powders having more excellent ignition characteristics and high material stability. [0003] Borides, on the other hand, are a very large group of compounds and are known to generally have high melting points and to be nonionic in nature. In particular, zirconium boride, as one of the metal borides, has a high melting point above 3000°C, exhibits a metallic luster appearance, mainly has the characteristics of metals such as high electri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C04B35/58C01B35/04C04B35/64
CPCC01B35/04C01P2002/86C01P2002/88C01P2006/12C04B35/58078C04B35/653C04B2235/3244C04B2235/422C04B2235/5409C04B2235/5436C04B2235/661C04B2235/72C04B2235/721C04B2235/76C22C1/10C22C29/14
Inventor 锅田卓二金西启太柳下定宽国贞泰一
Owner DAIICHI KIGENSO KAGAKU KOGYO CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap