Method and batching for precise control over apparent density of ceramic powder

A technology of ceramic powder and bulk density, which is applied in the field of ceramics, can solve the problem that it is difficult to obtain powder with particle size distribution, and achieve the effect of stabilizing the weight of the green body and improving the consistency of electrical properties

Inactive Publication Date: 2016-11-23
西安恒翔电子新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the particle size of electronic ceramic powder obtained by spray drying is affected by many process factors such as material formula, solid content of slurry, negative pressure, etc. It is difficult to obtain powders with exactly the same particle size distribution in different production batches.

Method used

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  • Method and batching for precise control over apparent density of ceramic powder
  • Method and batching for precise control over apparent density of ceramic powder
  • Method and batching for precise control over apparent density of ceramic powder

Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: Vibrating 500Kg of zinc oxide ceramic powder through a set of sieves composed of 80 mesh, 100 mesh, 150 mesh, 200 mesh and 250 mesh from top to bottom, see figure 2 , mixed according to the ratio in Table 1.

[0021] Granularity range Below 250 mesh 250~200 mesh 200~150 mesh 150~100 mesh 100~80 mesh 80 mesh or more add ratio 6 parts by weight 8 parts by weight 15 parts by weight 55 parts by weight 12 parts by weight 4 parts by weight

[0022] Table 2 lists the bulk density comparison of the powder treated by this patent and the five batches of powder produced by the traditional process:

[0023]

[0024] In Figure 2, series 1 is the powder processed by this patent, and series 2 is the powder without this patent. The two powders were dry pressed under the same conditions, and the target density was 3.25g / cm3. The figure shows the distribution of the density of the molded green sheets in the range of 3.10~3.4g / ...

Embodiment 2

[0026] Embodiment 2: Vibrating 500Kg of zinc oxide ceramic powder through a set of sieves composed of 80 mesh, 100 mesh, 150 mesh, 200 mesh and 250 mesh from top to bottom, see figure 2 , mixed according to the ratio in Table 3.

[0027] Granularity range Below 250 mesh 250~200 mesh 200~150 mesh 150~100 mesh 100~80 mesh 80 mesh or more add ratio 2 parts by weight 10 parts by weight 13 parts by weight 57 parts by weight 40 parts by weight 6 parts by weight

Embodiment 3

[0029] Vibrate 500Kg of zinc oxide ceramic powder through a set of sieves consisting of 80 mesh, 100 mesh, 150 mesh, 200 mesh and 250 mesh from top to bottom, see figure 2 , mixed according to the ratio in Table 4.

[0030] Granularity range Below 250 mesh 250~200 mesh 200~150 mesh 150~100 mesh 100~80 mesh 80 mesh or more add ratio 8 parts by weight 6 parts by weight 17 parts by weight 53 parts by weight 14 parts by weight 2 parts by weight

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Abstract

The invention relates to the field of ceramic, in particular to a method and batching for precise control over the apparent density of ceramic powder. The zinc oxide ceramic powder is screened through a sieve set in a vibrating mode, wherein the sieve set is composed of a 80-mesh sieve, a 100-mesh sieve, a 150-mesh sieve, a 200-mesh sieve and a 250-mesh sieve from top to bottom; 6 parts of ceramic powder with the particle size being 250 meshes or below, 8 parts of ceramic powder with the particle size being 250-200 meshes, 15 parts of ceramic powder with the particle size being 200-150 meshes, 55 parts of ceramic powder with the particle size being 150-100 meshes, 12 parts of ceramic powder with the particle size being 100-80 meshes and 4 parts of ceramic powder with the particle size being 80 meshes or above are subjected to weight batching. The method and batching have the advantages that the apparent density of the powder does not fluctuate along with the changes of production raw materials or technological conditions, a stable blank weight can be achieved in dry-pressing molding of the powder, and thus the electrical property consistency of elements can be improved.

Description

technical field [0001] The invention relates to the field of ceramics, in particular to a method and ingredients for accurately controlling the bulk density of ceramic powder. Background technique [0002] Spray drying is a method of using a spray dryer to evaporate the solution in the slurry droplets to obtain dry powder by means of atomization and heat. The spray drying process is the process in which the slurry is atomized by an atomizer to rapidly dry the slurry droplets into granules. It has been widely used in various modern electronics and functional ceramic industries. Spray drying has become an important process measure that is indispensable for the preparation of modern oxide ceramics with uniform composition and dry compaction body density, and obtaining components with good performance consistency. [0003] The spray-dried powder is formed into a green body by dry pressing. However, the amount of monomer product used in dry pressing depends on the volume of po...

Claims

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Application Information

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IPC IPC(8): C04B35/626
Inventor 杨培实
Owner 西安恒翔电子新材料有限公司
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