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Black ceramic and preparation method thereof

A technology for black ceramics and ceramic bodies, applied in the field of ceramic materials, can solve the problems of high cost and product color fluctuation, and achieve the effects of high density, stable black color development and cost saving

Active Publication Date: 2019-12-27
浙江古婺窑火陶瓷文化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the need to add black high-temperature pigments or colored metal oxides in the preparation process of the existing traditional silicate black ceramics, resulting in fluctuations in product color and high costs, and to provide a new black ceramic preparation method

Method used

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  • Black ceramic and preparation method thereof
  • Black ceramic and preparation method thereof

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preparation example Construction

[0044] This embodiment provides a method for preparing black ceramics, which includes the following steps: sintering a ceramic body and carbon black in a closed environment to obtain the black ceramics.

[0045]The invention utilizes the characteristics of high specific surface area and high activity of carbon black to sinter the ceramic body and carbon black at high temperature in a closed environment, and under the action of high-temperature self-infiltration of C element in carbon black, calcine to obtain pure black color ceramics.

[0046] What the inventor needs to explain is that carbon black is different from other carbon-containing substances (such as graphite), and its crystallization is very incomplete, with many defects and high activity. , heavy oil, fuel oil, etc.) are the products obtained by incomplete combustion or thermal decomposition under the condition of insufficient air. Carbon black, as a light, loose and extremely fine black powder, has a very large su...

Embodiment 1

[0069] The present embodiment provides a kind of preparation method of black ceramic, comprises the steps:

[0070] 1) Preparation of ceramic green body: in terms of mass fraction, the chemical composition is 70.5% SiO 2 , 19.08%Al 2 o 3 , 0.2% CaO, 0.6% MgO, 2.62% K 2 O, 0.75% Na 2 O, 0.25% Fe 2 o 3 And the ceramic green body with 6% loss on ignition is molded and dried, and then calcined at a low temperature of 750° C. to obtain a ceramic green body;

[0071] 2) Lay a layer of carbon black on the bottom of the sealable alumina crucible, that is, the first carbon black layer, and then place the ceramic green body obtained in step 1) on the first carbon black layer, and the ceramic green body The green body is located in the center of the crucible, and the central axis of the ceramic green body coincides with the central axis of the crucible;

[0072] 3) filling carbon black in the inner cavity of the ceramic green body and around the ceramic green body so that the carb...

Embodiment 2

[0080] The present embodiment provides a kind of preparation method of black ceramic, comprises the steps:

[0081] 1) Preparation of ceramic green body: in terms of mass fraction, the chemical composition is 70.5% SiO 2 , 19.08%Al 2 o 3 , 0.2% CaO, 0.6% MgO, 2.62% K 2 O, 0.75% Na 2 O, 0.25% Fe 2 o 3 And the ceramic green body with 6% loss on ignition is molded and dried, and then calcined at a low temperature of 750° C. to obtain a ceramic green body;

[0082] 2) Lay a layer of carbon black on the bottom of the sealable alumina crucible, that is, the first carbon black layer, and then place the ceramic green body obtained in step 1) on the first carbon black layer, and the ceramic green body The green body is located in the center of the crucible, and the central axis of the ceramic green body coincides with the central axis of the crucible;

[0083] 3) filling carbon black in the inner cavity of the ceramic green body and around the ceramic green body so that the carbon...

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Abstract

The invention relates to the technical field of ceramic materials, in particular to black ceramic and a preparation method thereof. The preparation method comprises the following step: sintering a ceramic green body and carbon black in a closed environment to obtain the black ceramic. The preparation method is simple in process, easy to operate and easy to control. Any black high-temperature pigment or colored metal oxide does not need to be added before green body making; the black ceramic with pure color and high density can be obtained through firing by only changing the firing process of the ceramic without changing the basic formula of the ceramic green body, a kiln structure and the firing atmosphere. The prepared black ceramic is uniform, free of black spots and high in blackness, and the black color is stable and does not fade after re-firing at the temperature of 900 DEG C or below.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a black ceramic and a preparation method thereof. Background technique [0002] Black pottery is a kind of unglazed pottery, which is made of colloidal clay by reducing flame firing process. The firing temperature is about 900-1000°C. The firing process is more advanced and complicated, and it needs to master the temperature and the atmosphere in the kiln to be successful. However, the firing of black pottery has not been able to solve the problem of water rupture, so it can only make some seemingly complicated but Crafts that cannot be used. Compared with black pottery, black ceramics are more widely used in knives, watch cases, molds, Ceramic decoration and various ceramic structural parts and other fields. [0003] Ceramics include pure oxide ceramics (such as alumina or zirconia ceramics) and traditional silicate ceramics. Due to the different sintering methods, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/18
CPCC04B35/64C04B35/18C04B2235/6562C04B2235/6567C04B2235/424C04B2235/3208C04B2235/3206C04B2235/3201C04B2235/3272C04B2235/9661C04B2235/96C04B2235/3232C04B2235/5454
Inventor 罗婷吴军明顾幸勇李萍刘昆曹志敏
Owner 浙江古婺窑火陶瓷文化有限公司
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