CN111253146A - Medium-far infrared ceramic powder and preparation method thereof - Google Patents
Medium-far infrared ceramic powder and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of middle and far infrared ceramic materials, in particular to high-emissivity lead-free middle and far infrared ceramic powder and a preparation method and application thereof. According to the invention, raw materials are simply ground and mixed according to a proportion, and are calcined at a medium and low temperature and then cooled to prepare the ceramic material so as to prepare the ceramic powder with medium and far infrared high normal emissivity; the ceramic powder prepared by the invention has high medium-far infrared normal emissivity, high stability and wide application value, and the preparation process is simple, the calcination temperature required for preparing the ceramic powder is medium temperature, the calcination temperature is reduced by 300-500 ℃ compared with the traditional calcination process, the energy consumption is saved, and the application field of the ceramic powder is expanded.
Description
Technical Field
The invention relates to the field of materials, in particular to preparation of middle-far infrared high normal emissivity lead-free ceramic powder, conductive slurry of the lead-free ceramic powder, and a preparation method and application of the conductive slurry.
Background
As a functional material which can be widely used, mid-and far-infrared radiation materials have been used in far-infrared heaters, heat-insulating coatings, food processing, and the like. Meanwhile, with the development of far infrared ceramic radiation materials, the far infrared technology has been increasingly widely applied in the fields of food processing, animal and plant cultivation, activation of fuel oil and water, medical care and the like. Particularly, at present, the pressure of work and life is gradually increased, so that people in sub-health state are increased, people pay more attention to their health condition, and more attention to physical therapy, so that far infrared function of physical therapy products is paid more attention to. However, most of the far infrared functional products in the current market have the defects of toxic lead raw materials, poor stability, low infrared emissivity and the like, and high-temperature sintering is needed in the preparation process, the preparation process of the slurry is complicated, and the like, so that the long-term stability and the use comfort of the materials are limited, the practical application and the expansion of the materials are prevented, and the inorganic ceramic powder in the current market is generally prepared at high temperature (higher than 1000 ℃) to cause certain energy waste, so that the development of the ceramic powder with medium-low high emissivity is a challenge. At present, few reports exist on the low-temperature preparation of the lead-free ceramic powder with medium and far infrared high normal emissivity. CN201310699751.2 discloses a high-toughness high-strength far infrared ceramic and a preparation method thereof, wherein the ceramic powder is prepared and sintered at the temperature of 700-750 ℃, and the emissivity is only 0.8; for example, CN201410714808.6 discloses that the energy consumption of preparation is large by continuous sintering at 750-850 ℃ for 2-4 hours. Researchers in patent 96105692.4 use medical stone or medical stone and natural ore as raw materials, through smashing, mixing, sieving, sintering through 1000 ~ 1300 ℃, heat preservation for 1 ~ 3h, then process the obtained medical stone far infrared ceramic material, send out 6 ~ 16um far infrared ray at normal temperature.
Disclosure of Invention
The invention provides a ceramic powder and a preparation method thereof, and the ceramic powder with high emissivity of lead-free middle and far infrared is prepared at medium and low temperature by selecting proper components and different contents thereof.
The lead-free middle and far infrared high-emissivity ceramic powder is prepared by the following method:
the method comprises the following steps of (1) mixing a magnesium source, a silicon source, an aluminum source, a titanium source, a boron source and a calcium source according to the mass ratio of the substances of 1-3: 1-3: 1-3: 1-3: 2-5: 4-8, sieving by using a 100-mesh and 300-mesh sieve, fully grinding the sieved raw materials in a mortar for 0.3-2 hours, sintering the uniformly ground and mixed raw materials in sintering equipment at the temperature of 500 ℃ for 1-3 hours, and naturally cooling the sintered ceramic powder to room temperature to prepare the ceramic powder with the particle size of 1-10 mu m.
The preferable mass ratio of the magnesium source, the silicon source, the aluminum source, the titanium source, the boron source and the calcium source is 1-1.5: 1-1.5: 1-1.5: 1-1.5: 2-2.5: 4 to 4.5.
The magnesium source is one or more of magnesium oxide, magnesium chloride, magnesium hydroxide, magnesium carbonate and magnesium sulfate, and magnesium oxide is preferred.
The silicon source is one or more of silicon dioxide, sodium silicate, aluminum silicate, magnesium silicate and calcium silicate, and preferably sodium silicate.
The aluminum source is one or more of aluminum chloride, aluminum oxide, aluminum hydroxide, aluminum carbonate and aluminum sulfate, and aluminum oxide is preferred.
The titanium source is one or more of titanium dioxide, titanium sulfate and titanium isopropoxide, and the titanium sulfate is preferred.
The boron source is one or more of boric acid, boric anhydride, sodium borate, ammonium borate, sodium metaborate and ammonium metaborate, and boric acid is preferred.
The calcium source is one or more of calcium oxide, calcium carbonate, calcium borate, calcium sulfate and calcium chloride, and calcium oxide is preferred.
The raw materials have no special requirements and can be obtained in a commercial mode.
In addition, the invention also comprises the application of the ceramic powder, and the mid-far infrared ceramic powder is applied to the aspects of far-infrared heaters, heat-insulating coatings, conductive coatings, textiles, food processing, medical care, environmental treatment and the like.
The preparation method has the beneficial effects that the emissivity of the ceramic powder obtained by the preparation method is above 0.9 in the middle and far infrared region within the temperature range of 25-70 ℃ through tests. Compared with the prior art, the preparation of the ceramic powder has the advantages of cheap and easily-purchased raw materials, short production period and low-medium temperature sintering, thereby reducing the energy consumption and the production cost.
Drawings
FIG. 1 is an X-ray diffraction pattern of the ceramic powder prepared in this patent;
FIG. 2 is a graph of Fourier infrared analysis of the ceramic powder material obtained in example 1;
FIG. 3 is a graph showing the emissivity of the ceramic powder material obtained in example 1;
Detailed Description
The present application is further illustrated below with reference to examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Example 1
In this example, ceramic powder (T) was prepared0) Grinding and mixing 8mmol of magnesium oxide, 10mmol of sodium silicate, 8mmol of aluminum oxide, 9mmol of titanium sulfate, 16mmol of boric acid and 32mmol of calcium oxide for 1 hour, grinding and sieving (200 meshes), putting into a muffle furnace, heating to 500 ℃ per minute at 10 ℃, preserving heat for 1 hour, and naturally cooling to room temperature. The diffraction pattern of the prepared ceramic powder is shown in figure 1. The Fourier infrared of the prepared ceramic powder is shown in figure 2; FIG. 3 is a graph showing the emissivity of the ceramic powder material obtained in example 1.
EXAMPLE 2
16mmol of magnesium chloride, 20mmol of sodium silicate, 25mmol of aluminum chloride, 20mmol of titanium isopropoxide, 32mmol of boric acid and 48mmol of calcium oxide in the self-made ceramic powder prepared in the embodiment are ground and mixed for 1 hour, then ground and sieved (200 meshes), put into a muffle furnace to be heated to 350 ℃ per minute at 10 ℃, kept for two hours and naturally cooled to room temperature.
Example 3
8mmol of magnesium chloride, 10mmol of silicon dioxide, 10mmol of aluminum oxide, 10mmol of titanium oxide, 16mmol of boric acid and 24mmol of calcium oxide in the self-made ceramic powder prepared in the embodiment are ground and mixed for 1 hour, then ground and sieved (200 meshes), put into a muffle furnace to be heated to 500 ℃ per minute at 10 ℃, kept for two hours and naturally cooled to room temperature.
Example 4
8mmol of magnesium borate, 10mmol of silicon dioxide, 10mmol of aluminum chloride, 10mmol of titanium dioxide, 16mmol of sodium borate and 24mmol of calcium chloride in the self-made ceramic powder prepared in the embodiment are ground and mixed for 1 hour, then ground and sieved (200 meshes), put into a muffle furnace to be heated to 400 ℃ per minute at 10 ℃, kept for two hours and naturally cooled to room temperature.
Example 5
Comparison of preparation temperature, stability and emissivity of ceramic powders of inventive examples 1-4 with those of the prior art (CN201310699751.2 example 1)
The above description is only for the purpose of illustrating the present invention and is not intended to limit the present invention in any way, and the present invention is not limited to the above description, but rather should be construed as being limited to the scope of the present invention.
Claims (9)
1. A middle and far infrared ceramic powder is characterized in that: the ceramic powder is prepared by the following method:
the method comprises the following steps of (1) mixing a magnesium source, a silicon source, an aluminum source, a titanium source, a boron source and a calcium source according to the mass ratio of the substances of 1-3: 1-3: 1-3: 1-3: 2-5: 4-8, sieving by using a 100-mesh and 300-mesh sieve, fully grinding the sieved raw materials in a mortar for 0.3-2 hours, sintering the uniformly ground and mixed raw materials in sintering equipment at the temperature of 500 ℃ for 1-3 hours, and naturally cooling the sintered ceramic powder to room temperature to prepare the ceramic powder with the particle size of 1-10 mu m.
2. The mid-far infrared ceramic powder according to claim 1, characterized in that: the mass ratio of the magnesium source, the silicon source, the aluminum source, the titanium source, the boron source and the calcium source is 1-1.5: 1-1.5: 1-1.5: 1-1.5: 2-2.5: 4 to 4.5.
3. The mid-far infrared ceramic powder according to claim 1, characterized in that: the magnesium source is one or more of magnesium oxide, magnesium chloride, magnesium hydroxide, magnesium carbonate and magnesium sulfate.
4. The mid-far infrared ceramic powder according to claim 1, characterized in that: the silicon source is one or more of silicon dioxide, sodium silicate, aluminum silicate, magnesium silicate and calcium silicate.
5. The mid-far infrared ceramic powder according to claim 1, characterized in that: the aluminum source is one or more of aluminum chloride, aluminum oxide, aluminum hydroxide, aluminum carbonate and aluminum sulfate.
6. The mid-far infrared ceramic powder according to claim 1, characterized in that: the titanium source is one or more of titanium dioxide, titanium sulfate and titanium isopropoxide.
7. The mid-far infrared ceramic powder according to claim 1, characterized in that: the boron source is one or more of boric acid, boric anhydride, sodium borate, ammonium borate, sodium metaborate and ammonium metaborate.
8. The mid-far infrared ceramic powder according to claim 1, characterized in that: the calcium source is one or more of calcium oxide, calcium carbonate, calcium borate, calcium sulfate and calcium chloride.
9. The use of the mid-far infrared ceramic powder according to claim 1, wherein the mid-far infrared ceramic powder is used in a far-infrared heater, a thermal insulation coating, a conductive coating, a textile, food processing, medical care, and environmental treatment.
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CN112225549A (en) * | 2020-08-25 | 2021-01-15 | 深圳京鲁计算科学应用研究院 | Bionic far infrared ceramic powder material and preparation method thereof |
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