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Silicon carbide crystal whisker in-situ composite lithium ceramic material and preparation method thereof

A silicon carbide whisker, in-situ composite technology, applied in the field of ceramic materials, can solve the problems of difficult sintering of lithium ceramics, high raw material cost, increased thermal conductivity, etc., and achieves high density, high mechanical strength, and improved performance. Effect

Inactive Publication Date: 2019-12-20
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few examples of combining silicon carbide whiskers with lithium porcelain in the prior art. The reasons are: first, silicon carbide whiskers are covalent compounds, which are naturally incompatible with the ionic compound system of lithium porcelain. Coupled with the anti-densification effect of silicon carbide whiskers, lithium porcelain is not easy to sinter after adding silicon carbide whiskers; second, if the traditional air atmosphere is used for sintering after adding silicon carbide whiskers, silicon carbide whiskers are easy to Oxidation during the forming process leads to foaming of the product, but it does not enhance and increase thermal conductivity; third, silicon carbide whiskers are industrial raw materials with high cost and a certain length-to-diameter ratio, and there are problems of high raw material cost and poor mixing Problems of uniformity and uneven performance

Method used

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  • Silicon carbide crystal whisker in-situ composite lithium ceramic material and preparation method thereof
  • Silicon carbide crystal whisker in-situ composite lithium ceramic material and preparation method thereof
  • Silicon carbide crystal whisker in-situ composite lithium ceramic material and preparation method thereof

Examples

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Embodiment 1

[0022] 1. A silicon carbide whisker in-situ composite lithium ceramic material in this embodiment includes a base material and a binder; the base material is composed of petalite (250 mesh) 16wt%, spodumene (250 mesh) 16wt% %, kaolin (325 mesh) 35wt%, ball clay (325 mesh) 15wt%, quartz powder (80 mesh) 8wt%, metal silicon powder (250 mesh) 7wt%, graphite powder (250 mesh) 3wt%; binder is Water and dextrin, its consumption is respectively 6wt% and 1wt% of base material.

[0023] 2. The preparation method of a silicon carbide whisker in-situ composite lithium ceramic material in this embodiment is as follows:

[0024] After mixing the components of the above-mentioned base material, add a binder and mix evenly; after stirring and trapping the material, select an appropriate pressure according to the size of the product for compression molding, and dry it at a temperature of 110°C to obtain a green body (moisture content in the kiln < 1%) ; Then bury graphite powder and burn at ...

Embodiment 2

[0026] 1. A silicon carbide whisker in-situ composite lithium ceramic material in this embodiment includes a base material and a binder; the base material is composed of petalite (80 mesh) 14wt%, spodumene (150 mesh) 14wt% %, kaolin (325 mesh) 30wt%, ball clay (80 mesh) 5wt%, bentonite (250 mesh) 7wt%, quartz powder (325 mesh) 10wt%, metal silicon powder (325 mesh) 14wt%, carbon black powder ( 250 mesh) 6wt%; the binding agent is water and waste paper slurry, and its consumption is respectively 10wt% and 1wt% of the base material.

[0027] 2. The preparation method of a silicon carbide whisker in-situ composite lithium ceramic material in this embodiment is as follows:

[0028] After mixing the components of the above-mentioned base material, add a binder and mix evenly; after stirring and trapping the material, select an appropriate pressure according to the size of the product for compression molding, and dry it at a temperature of 110°C to obtain a green body (moisture cont...

Embodiment 3

[0030] 1. In this embodiment, a silicon carbide whisker in-situ composite lithium ceramic material includes a base material and a binder; the base material is composed of petalite (150 mesh) 12wt%, spodumene (325 mesh) 12wt% %, kaolin (325 mesh) 30wt%, ball clay (150 mesh) 14wt%, quartz powder (325 mesh) 2wt%, metal silicon powder (150 mesh) 21wt%, carbon powder (250 mesh) 9wt%; binder is Water and the PVA solution with a concentration of 5% are used in an amount of 8 wt% and 2 wt% of the base material, respectively.

[0031] 2. The preparation method of a silicon carbide whisker in-situ composite lithium ceramic material in this embodiment is as follows:

[0032] After mixing the components of the above-mentioned base material, add a binder and mix evenly; after stirring and trapping the material, select an appropriate pressure according to the size of the product for compression molding, and dry it at a temperature of 110°C to obtain a green body (moisture content in the kil...

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Abstract

The invention discloses a silicon carbide crystal whisker in-situ composite lithium ceramic material which comprises a base material and a bonding agent, wherein the base material comprises the following components: 15-32wt% of a lithium mineral raw material, 25-50wt% of a clay raw material, 2-10wt% of quartz powder, 7-28wt% of metal silicon powder and 3-12wt% of a carbon source material; the amount of the bonding agent accounts for 6-12wt% of the base material; and the silicon carbide crystal whisker in-situ composite lithium ceramic material is prepared by preparing the base material and thebonding agent into a crude blank and by performing carbon burying sintering. In addition, the invention further discloses a preparation method of the silicon carbide crystal whisker in-situ compositelithium ceramic material. By adjusting formula systems, doping the metal silicon powder and the carbon source material and implementing carbon burying sintering, a silicon carbide crystal whisker isintroduced into a lithium ceramic in an in-situ synthesis method, and thus the lithium ceramic material with high heat conductivity and high strength is prepared.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a silicon carbide whisker in-situ composite lithium ceramic material and a preparation method thereof. Background technique [0002] Lithium porcelain is a ceramic material with low expansion and high thermal stability. It is a commonly used material for heat-resistant porcelain (that is, heat-resistant pots that people use daily). However, lithium porcelain has inherent defects of low thermal conductivity and high specific heat capacity, which prolongs the heating time and increases energy consumption during use; in addition, the low strength of lithium porcelain makes it unable to withstand rapid cooling and rapid heating. The resulting thermal stress easily leads to fracture, which restricts the improvement of its added value. Silicon carbide whiskers have the advantages of high modulus, high thermal conductivity, high strength and high thermal shock resistance, whi...

Claims

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Application Information

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IPC IPC(8): C04B33/36C04B33/16C04B33/13C04B33/132
CPCC04B33/1305C04B33/131C04B33/132C04B33/16C04B33/36C04B2235/3472C04B2235/422C04B2235/424C04B2235/425C04B2235/428C04B2235/5276C04B2235/96C04B2235/9607Y02P40/60
Inventor 劳新斌徐笑阳江伟辉梁健梁凌峰
Owner JINGDEZHEN CERAMIC INSTITUTE