Tabletting and molding method for nano sticky powder

A molding method and powder technology, which is applied in the field of tablet molding of nano-viscous powder, can solve the problems that the release agent cannot meet the needs of tablet molding, related process obstacles, and difficulty in demoulding, so as to promote adhesion, Improve the electrical performance and increase the effect of the interface

Active Publication Date: 2015-11-11
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For viscous nanopowders, when molding with a mold, it is often difficult to release the mold due to the strong adhesion between the powder and the mold during high-pressure pressing
For some special nano-viscous powders, such as nano-rare earth-doped cerium oxide (RDC) with high dispersion and weak agglomeration, conventional mold release agents still cannot meet the needs of tablet molding, causing huge obstacles to subsequent related processes

Method used

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  • Tabletting and molding method for nano sticky powder
  • Tabletting and molding method for nano sticky powder
  • Tabletting and molding method for nano sticky powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1. Combine Figure 1 to Figure 3 , according to 0.1~0.6g / cm 2 The nano-viscous gadolinium-doped cerium oxide (GDC) powder 5 is weighed and evenly loaded into the mold, and lightly pressed manually so that the GDC powder 5 has an appropriate bulk density. At this time, the pressure should be moderate. If the pressure is too high, the powder will be easily bonded to the mold. If the pressure is too low, the powder will not be basically fixed. In the subsequent steps, the GDC powder 5 will easily mix with the barrier layer, resulting in difficulty in demoulding.

[0029] Step 2. Invert the mold, and place a supporting body 6 under the mould. The supporting body is an annular supporting body. The height of the support body 6 is equivalent to the vertical distance between the top of the mold pressing shaft 4 and the upper edge of the mold cavity 3 . The function of the support body 6 is to prevent the large displacement of the uncompressed green body, take out the upp...

Embodiment 2

[0033] Step 1. Put 0.1~0.6g / cm in the mold 2 NiO, GDC and pore-forming agent anode mixed powder, the mass ratio of the three is 5:5:1, gently flattened, so that the powder has an appropriate bulk density. At this time, the pressure should be moderate. If the pressure is too high, the powder will not be well combined with the electrolyte that will be co-pressed with it. If the pressure is too low, the powder will not be basically fixed.

[0034] Step 2. Invert the mold, place a ring-shaped support under the mold, take out the mold gasket above, and use a 80-600 mesh screen to filter the weighed nano GDC viscous powder (0.02-0.2g / cm 2 ) spread evenly over the anode body, and then put into the mold gasket and press it manually again.

[0035] Step 3. Take out the mold gasket, continue to spread an appropriate amount of barrier layer powder on the viscous GDC powder with a sieve of 80-600 mesh, with a thickness of 2-200 μm, and then put the mold gasket and mold base again .

[...

Embodiment 3

[0039] This embodiment is implemented on the basis of embodiment 1, and the difference from embodiment 1 is only that: the barrier layer powder in embodiment 1 is changed into a weighing paper sheet with the same shape and area as the mold gasket, and the rest are the same Example 1.

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Abstract

The invention discloses a tabletting and molding method for nano sticky powder. The method comprises the following steps: uniformly filling a mold with a certain amount of nano sticky powder, and manually pressing the powder lightly; reversing the mold, taking out a mold gasket above, paving a layer of relatively thin blocked layer powder on the nano powder or putting a paper scrap which is equal to the mold gasket in area on the powder, and then putting the mold gasket again; reversing the mold again, taking out a mold pressing shaft, paving a blocked layer or the paper scrap on the other side of a green body and then putting the mold gasket or the mold pressing shaft again; and molding the powder on a tablet machine under the pressure of 10-500MPa, and demolding the powder, so as to obtain the product. The tabletting and molding method for the nano sticky powder disclosed by the invention is simple to operate and high in repeatability; and the problem that the nano sticky powder is difficult to mold and demold is effectively solved.

Description

technical field [0001] The invention relates to a tablet forming method of viscous powder, in particular to a tablet forming method of nano viscous powder. Background technique [0002] Compared with micron or submicron powders, ultrafine nanopowders have attracted widespread attention because of their excellent electrical, catalytic, mechanical, and optical properties. So far, researchers have developed many different nanomaterial synthesis techniques, and the properties of the prepared nanomaterials vary widely. Some of the powders produced obvious stickiness after nanometerization. For viscous nanopowders, when molding with a mold, it is often difficult to release the mold due to the strong adhesion between the powder and the mold during high-pressure pressing. For some special nano-viscous powders, such as nano-rare earth-doped cerium oxide (RDC) with high dispersion and weak agglomeration, conventional release agents still cannot meet the needs of tablet molding, caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/10
CPCH01M8/10Y02E60/50
Inventor 梁锦平
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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