Silver grey ceramic colour and process for its production

Abstract

The present application relates to the production process of ceramic color, in particular to a kind of silver gray ceramic color and its production method, the method is by controlling the granularity of fused zirconia, adding quartz powder, coloring agent cobalt oxide, nickel oxide, chrome green, iron oxide, auxiliary material sodium fluorosilicate, magnesium fluoride, potassium chloride, according to certain proportion is mixed and grinded, then the mixed material is heated and calcined, after cooling, again after grinding and crushing, the sample is prepared.The silver gray color produced is in the better color effect, the process flow is simple, harmful gas is not produced in the production process, the process is green and environmental protection, under the same conditions, the color material use cost of ceramic color industry is saved, the product demand in the field such as daily-use ceramic and industrial ceramic is met.

Description

Technical Field

[0001] This invention relates to the production process of ceramic pigments, and particularly to a silver-gray ceramic pigment and its production method. Background Technology

[0002] Zirconium-based ceramic colorants possess excellent properties such as strong tinting strength, rich color tones, stable color, and good miscibility. Currently, in the field of ceramic colorants, praseodymium yellow, vanadium blue, and iron red colorants use zirconium oxide as a base. Traditional silver-gray ceramic colorants use antimony oxide and tin oxide as raw materials. However, due to the high price of antimony oxide and tin oxide, the production cost is too high, which cannot meet the application requirements of silver-gray colorants in daily-use ceramics and industrial ceramics. Therefore, it is necessary to provide a low-cost production method for silver-gray ceramic colorants. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a silver-gray ceramic pigment and its production method.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A silver-gray ceramic pigment, prepared from the following raw materials in parts by weight:

[0006] 55-65 parts of fused zirconium oxide with a particle size of 1.5-2.5 μm, 25-35 parts of quartz powder, 4.7-5.3 parts of colorant, and 3-6 parts of auxiliary materials;

[0007] The colorant is composed of cobalt oxide, nickel oxide, chrome green and iron oxide;

[0008] The auxiliary materials consist of sodium fluorosilicate, magnesium fluoride, and potassium chloride.

[0009] Furthermore, in the aforementioned silver-gray ceramic pigment, the colorant is composed of the following raw materials in parts by weight:

[0010] 0.8 to 1 part cobalt oxide, 0.7 to 0.8 parts nickel oxide, 1.7 to 1.8 parts chrome green, and 1.5 to 1.7 parts iron oxide.

[0011] Furthermore, in the aforementioned silver-gray ceramic pigment, the auxiliary material is composed of the following raw materials in parts by weight:

[0012] 1-2 parts sodium fluorosilicate, 1-2 parts magnesium fluoride, and 1-2 parts potassium chloride.

[0013] Furthermore, the aforementioned silver-gray ceramic pigment is prepared from the following raw materials by mass percentage:

[0014] 55%~65% particle size 1.5~2,5 μm of electrically fused zirconium oxide, 25%~35% of quartz powder, 1%~2% of sodium fluorosilicate, 1%~2% of magnesium fluoride, 1%~2% of potassium chloride, 0.8%~1% of cobalt oxide, 0.7%~0.8% of nickel oxide, 1.7%~1.8 of chromium green, 1.5%~1.7% of iron oxide.

[0015] The preparation method of the silver-gray ceramic colorant comprises the following steps:

[0016] The raw materials are mixed, ground, calcined, cooled, and then ground and crushed to obtain the ceramic colorant.

[0017] Further, in the preparation method of the silver-gray ceramic colorant, the calcination specifically comprises: uniformly heating for 6~8 hours to 1050±10℃, rapidly cooling for 3 minutes to 900℃, heating for 30~60 minutes to 1020±10℃, and keeping the temperature for two hours.

[0018] The present application has the advantages that, different from the prior art (using 90%~95% tin oxide and 5%~10% antimony oxide), the present application uses cobalt oxide, nickel oxide, chromium green, and iron oxide colorants to adjust the color, and uses zirconia as a substrate to prepare a silver-gray ceramic colorant, which only increases the types of raw materials and does not increase the process flow, and compared with the market unit prices of tin oxide and antimony oxide, the price of zirconia is low, the production cost is greatly reduced, harmful gases are not generated in the production process, the production demands of enterprises for low cost, high efficiency, and environmental protection are met, the colorant use cost of the ceramic colorant industry is saved under the same conditions, and the product demands in the fields of daily-use ceramics and industrial ceramics are met. DETAILED DESCRIPTION

[0019] To illustrate the technical content, purposes and effects of the present application, the following embodiments are provided.

[0020] Embodiment 1:

[0021] A preparation method of a silver-gray ceramic colorant comprises the following steps:

[0022] Step 1, 60% of electrically fused zirconium oxide with a particle size of 1.5 μm, 30% of quartz powder, 1% of sodium fluorosilicate, 2% of magnesium fluoride, 2% of potassium chloride, 0.9% of cobalt oxide, 0.75% of nickel oxide, 1.75% of chromium green, and 1.6% of iron oxide are mixed and ground according to the mass percentage;

[0023] Step 2, the mixture obtained in step 1 is placed in a calcination furnace and uniformly heated for 7 hours to 1050℃, rapidly cooled for 3 minutes to 900℃, heated for 60 minutes to 1020℃, kept for two hours, and cooled;

[0024] Step 3, grinding the mixture after calcination in step 2 to obtain a ceramic colorant, which presents silver gray.

[0025] Example 2

[0026] A method for preparing a silver gray ceramic colorant, comprising the following steps:

[0027] Step 1, according to the mass percentage, 55% of the particle size of 2.0 μm of fused zirconia, 35% of the quartz powder, 1% of sodium fluorosilicate, 1.5% of magnesium fluoride, 2.5% of potassium chloride, 0.85% of cobalt oxide, 0.8% of nickel oxide, 1.7% of chromium green, 1.65% of iron oxide are mixed and ground;

[0028] Step 2, the mixture obtained in step 1 is placed in a calcination furnace and uniformly heated to 1060℃ for 8 hours, rapidly cooled to 900℃ for 3 minutes, then heated to 1010℃ for 30 minutes and kept for 2 hours, and then cooled;

[0029] Step 3, grinding the mixture after calcination in step 2 to obtain a ceramic colorant, which presents silver gray.

[0030] Example 3

[0031] A method for preparing a silver gray ceramic colorant, comprising the following steps:

[0032] Step 1, according to the mass percentage, 65% of the particle size of 2.2 μm of fused zirconia, 25% of the quartz powder, 1.5% of sodium fluorosilicate, 1.5% of magnesium fluoride, 2% of potassium chloride, 0.95% of cobalt oxide, 0.7% of nickel oxide, 1.75% of chromium green, 1.6% of iron oxide are mixed and ground;

[0033] Step 2, the mixture obtained in step 1 is placed in a calcination furnace and uniformly heated to 1050℃ for 8 hours, rapidly cooled to 900℃ for 3 minutes, then heated to 1030℃ for 50 minutes and kept for 2 hours, and then cooled;

[0034] Step 3, grinding the mixture after calcination in step 2 to obtain a ceramic colorant, which presents silver gray.

[0035] Comparative Example 1

[0036] A method for preparing a silver gray ceramic colorant, comprising the following steps:

[0037] Step 1, according to the mass percentage, 50% of the particle size of 2.0 μm of fused zirconia, 30% of the quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 10% of antimony oxide, 5% of tin oxide are mixed and ground;

[0038] Step 2, the mixture obtained in step 1 is placed in a calcining furnace and uniformly heated to 1050℃ for 6 hours, rapidly cooled to 900℃ for 3 minutes, heated to 1020℃ for 60 minutes, and then kept for 2 hours, and then cooled;

[0039] Step 3, the mixture obtained in step 2 is ground and broken to obtain a ceramic colorant with a color of off-white.

[0040] The above method is the first solution that the inventors think of when solving the technical problem of reducing the preparation cost of silver-gray ceramic colorant. Since the traditional method uses antimony oxide and tin oxide as raw materials, the antimony oxide and tin oxide are used as both the base and the colorant. Referring to praseodymium yellow, iron red, and vanadium blue colorants, zirconia is used as the base. The inventors consider using zirconia to replace the antimony oxide and tin oxide as the base for experiments.

[0041] It is found that the obtained ceramic colorant is off-white, and the silver-gray ceramic colorant cannot be obtained.

[0042] Comparative Example 2

[0043] A preparation method of a silver-gray ceramic colorant, comprising the following steps:

[0044] Step 1, 30% of fused zirconia with a particle size of 2.0 μm, 20% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 30% of antimony oxide, 10% of tin oxide, are mixed and ground according to the mass percentage;

[0045] Step 2, the mixture obtained in step 1 is placed in a calcining furnace and uniformly heated to 1050℃ for 6 hours, rapidly cooled to 900℃ for 3 minutes, heated to 1020℃ for 60 minutes, and then kept for 2 hours, and then cooled;

[0046] Step 3, the mixture obtained in step 2 is ground and broken to obtain a ceramic colorant with a color of off-white.

[0047] Based on Comparative Example 1, the inventors consider that the reason why the silver-gray ceramic colorant cannot be obtained may be that the content of antimony oxide and tin oxide is not enough. Therefore, the content of antimony oxide and tin oxide is increased in Comparative Example 2, but the color of the obtained ceramic colorant is still off-white, which is not improved.

[0048] Comparative Example 3

[0049] A preparation method of a silver-gray ceramic colorant, comprising the following steps:

[0050] Step 1, 55% of fused zirconia with a particle size of 1.0 μm, 35% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 1% of cobalt oxide, 0.7% of nickel oxide, 1.8% of chromium green, and 1.5% of iron oxide are mixed and ground as a first sample according to the mass percentage;

[0051] Mix and grind 55% of fused zirconia with particle size of 1.2 μm, 35% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 1% of cobalt oxide, 0.7% of nickel oxide, 1.8% of chromium green, 1.5% of iron oxide as No. 2 sample;

[0052] Mix and grind 55% of fused zirconia with particle size of 3.5 μm, 35% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 1% of cobalt oxide, 0.7% of nickel oxide, 1.8% of chromium green, 1.5% of iron oxide as No. 3 sample;

[0053] Mix and grind 55% of fused zirconia with particle size of 12.5 μm, 35% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 1% of cobalt oxide, 0.7% of nickel oxide, 1.8% of chromium green, 1.5% of iron oxide as No. 4 sample;

[0054] Mix and grind 55% of fused zirconia with particle size of 17.0 μm, 35% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 1% of cobalt oxide, 0.7% of nickel oxide, 1.8% of chromium green, 1.5% of iron oxide as No. 5 sample;

[0055] Mix and grind 55% of fused zirconia with particle size of 2.0 μm, 35% of quartz powder, 2% of sodium fluorosilicate, 2% of magnesium fluoride, 1% of potassium chloride, 1% of cobalt oxide, 0.7% of nickel oxide, 1.8% of chromium green, 1.5% of iron oxide as No. 6 sample;

[0056] Step 2, put the six mixtures obtained in step 1 into a calcining furnace, uniformly heat for 6 hours to 1050℃, rapidly cool for 3 minutes to 900℃, then heat for 60 minutes to 1030℃ and keep for 2 hours, and then cool;

[0057] Step 3, grind and crush the six mixtures after calcination in step 2 to obtain ceramic pigments.

[0058] Through experiments, zirconia, antimony oxide and tin oxide as colorants cannot be used to prepare silver gray pigments. The inventors consider that the particle size range of zirconia is used for comparison experiments in reference to praseodymium yellow, iron red and vanadium blue pigments.

[0059] In the above comparative example 3, the No. 1 and No. 2 samples are whiter than the comparative sample, showing light silver gray color, and the finer the particle size, the lighter the color; the No. 3 sample is darker than the No. 6 sample, showing dark silver gray color; the No. 4 and No. 5 samples show black gray color, and the coarser the particle size, the darker the color.

[0060] In summary, the application provides a silver-gray ceramic colorant production method, which uses zirconia as a base, adds coloring agents cobalt oxide, nickel oxide, chromium green and iron oxide, and auxiliary materials sodium fluorosilicate, magnesium fluoride and potassium chloride, controls the content ratio, controls the particle size of the fused zirconia, makes the produced silver-gray colorant have a better color development effect, saves the colorant use cost in the ceramic colorant industry under the same conditions, and meets the product demand in the fields of daily-use ceramics and industrial ceramics.

[0061] The above description is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent transformation or direct or indirect application in the related technical field by using the content of the application specification is also included in the patent protection scope of the application.

Claims

1. A silver-gray ceramic color, characterized in that, It is prepared from the following raw materials: 55~65 parts of 1.5~2.5μm particle size of fused zirconia, 25~35 parts of quartz powder, 4.7-5.3 parts of colorant, 3-6 parts of auxiliary material; The colorant consists of cobalt oxide, nickel oxide, chrome green and iron oxide; The auxiliary material consists of sodium fluosilicate, magnesium fluoride and potassium chloride; The colorant consists of the following raw materials: 0.8~1 parts of cobalt oxide, 0.7~0.8 parts of nickel oxide, 1.7~1.8 parts of chrome green, 1.5~1.7 parts of iron oxide.

2. The silver grey ceramic color of claim 1, characterized in that, The auxiliary material consists of the following raw materials: 1~ 2 parts of sodium fluosilicate, 1~ 2 parts of magnesium fluoride, 1~ 2 parts of potassium chloride.

3. The silver gray ceramic color of claim 1, wherein, It is prepared from the following raw materials: 55%~65% of 1.5~2.5μm particle size of fused zirconia, 25%~35% of quartz powder, 1%~ 2% of sodium fluosilicate, 1%~2% of magnesium fluoride, 1%~ 2% of potassium chloride, 0.8%~1% of cobalt oxide, 0.7%~0.8% of nickel oxide, 1.7%~1.8% of chrome green, 1.5%~1.7% of iron oxide.

4. Process for the preparation of a silver grey ceramic colour according to any one of claims 1 to 3, characterised in that, It comprises the following steps: Mix the raw materials, grind, calcine, cool, and then grind and crush to obtain the ceramic colorant.

5. The method for preparing a silver-gray ceramic color according to claim 4, characterized in that, The calcination specifically comprises: uniformly heating for 6~8 hours to 1050±10℃, rapidly cooling to 900℃ for 3 minutes, heating to 1020±10℃ for 30~60 minutes, and keeping the temperature for 2 hours.