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Use of zirconium hydrogen crystal grain accretion inhibitor

A technology of inhibitors and grains, which is applied in the field of powder metallurgy, can solve the problems of reducing the hardness of cemented carbide, reducing the coercive force, and deteriorating squareness, etc., and achieve the effects of improving flexibility, increasing coercive force, and preventing cracking

Active Publication Date: 2009-12-16
NINGBO KONIT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: in magnetic materials, it will lead to a decrease in coercive force and poor squareness; in the preparation of cemented carbide, it will reduce the hardness of cemented carbide, be easy to crack, and not wear-resistant; in ceramics, it will be easy to crack and have a bad appearance Wait

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0016] A preparation process of a zirconium hydrogen grain growth inhibitor, the measures include: putting sponge zirconium or chopped metal zirconium into a hydrogen crushing furnace, and vacuuming the hydrogen crushing furnace to 1×10 -1 Pa, and then feed hydrogen into the hydrogen crushing furnace to 0.05MPa~0.2MPa; heat the hydrogen crushing furnace to 200°C~600°C, zirconium and hydrogen react to form a zirconium hydrogen compound, which is a zirconium hydrogen grain growth inhibitor, and the molecular formula is ZrHx ; After the reaction between zirconium and hydrogen is completed, the hydrogen crushing furnace is evacuated to at least 1Pa, and then the hydrogen crushing furnace is fed with Ar gas to at least 0.01MPa; The zirconium hydrogen compound product in the crushing furnace is cooled to room temperature; the product of the zirconium hydrogen grain growth inhibitor is protected with nitrogen during the process of leaving the furnace, and the product of the zirconium ...

Embodiment 2

[0022] The NdFeB micropowder and zirconium hydrogen grain growth inhibitor described in Example 1 were mixed in a mixer at a weight ratio of 99.9:0.1. After mixing for 3 hours, they were sintered, aged, machined and measured for magnetic properties. The sintering temperature range is 1085°C±10°C, and the density is 7.54g / cm 3 ~7.58g / cm 3. Magnetic properties: Br=1.36T~1.40T, Hci=1160KA / m~1440KA / m, (BH)max=350KJ / m 3 ~380KJ / m 3 .

[0023] Comparative example of the present invention compared with prior art

[0024] The NdFeB micropowder described in Example 1 was directly pressed into a magnetic field, then sintered, aged, machined and tested for magnetic properties. The sintering temperature range is 1060°C±5°C, and the density is 7.53g / cm 3 ~7.55g / cm 3 . Magnetic properties: Br=1.37T~1.41T, Hci=1114KA / m~1353KA / m, (BH)max=358KJ / m 3 ~382KJ / m 3 .

[0025] The summary of embodiment one, two and comparative example sees table one

[0026] Table 1. Magnet performance com...

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Abstract

The invention discloses the use of a zirconium hydrogen crystal grain growth inhibitor, wherein the preparation process of the zirconium hydrogen crystal grain growth inhibitor is placing sponge zirconium or chopped metal zirconium into a hydrogen crushing furnace, and vacuuming the hydrogen crushing furnace To 1 × 10-1Pa, and then pass hydrogen into the hydrogen crushing furnace to 0.05MPa ~ 0.2MPa; heat the hydrogen crushing furnace to 200 ℃ ~ 600 ℃, after the reaction of zirconium and hydrogen is completed, the zirconium hydrogen compound is generated as zirconium hydrogen crystal grains Growth inhibitor, the molecular formula is ZrHx; it has the characteristics of simplicity and practicality without dehydrogenation; the use of the zirconium hydrogen grain growth inhibitor can be applied to the field of powder metallurgy including cemented carbide and magnetic materials , and the field of ceramics; it has the characteristics of being easily broken to the micron level, especially for the preparation of sintered NdFeB magnets.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to the use of a zirconium hydrogen grain growth inhibitor. Background technique [0002] Powder metallurgy often encounters the problem of abnormal grain growth, which will damage the quality of the product. For example: in magnetic materials, it will lead to a decrease in coercive force and poor squareness; in the preparation of cemented carbide, it will reduce the hardness of cemented carbide, be easy to crack, and not wear-resistant; in ceramics, it will be easy to crack and have a bad appearance Wait. At present, the commonly used inhibitors for controlling grain growth in cemented carbide are: VC, Mo 2 C, Cr 3 C, NbC, TaC, TiC, ZrC, ThO 2 Wait. In the existing technology, VC, Cr 3 C 2 A new solid-solution grain growth inhibitor system was developed, which can be uniformly dispersed in WC / Co, thereby inhibiting grain growth more effectively. For example, when W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C29/08C22C33/02C04B35/63C01B6/02
Inventor 姚宇良梁树勇苏振华彭维波
Owner NINGBO KONIT IND
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