Silicon carbide porous ceramic material and preparation method of silicon carbide porous ceramic material

A technology of porous ceramics and silicon carbide, applied in the field of material science, can solve the problems of high energy consumption, complex components and processes, and achieve the effect of low energy consumption and high promotion value

Active Publication Date: 2015-12-30
SOUTHEAST UNIV
10 Cites 7 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0011] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a silicon carbide porous ceramic mat...
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Abstract

The invention discloses a silicon carbide porous ceramic material and a preparation method of the silicon carbide porous ceramic material. The preparation method comprises the following steps of firstly performing mechanical stirring on water glass, silicon carbide powder and water; then, performing ball milling to prepare slurry; next, immersing and hanging the slurry onto a template to obtain a pre-formed body; preserving the temperature for 24 to 36h at 40 to 100 DEG C; obtaining primarily solidified porous ceramics; finally, performing heating and heat preservation to obtain a finished product. The cost of the method is low; the prepared porous ceramic hole diameter and the porosity are controllable; the intensity is high; the chemical stability is high.

Application Domain

Ceramicware

Technology Topic

Chemical stabilitySlurry +2

Image

  • Silicon carbide porous ceramic material and preparation method of silicon carbide porous ceramic material
  • Silicon carbide porous ceramic material and preparation method of silicon carbide porous ceramic material
  • Silicon carbide porous ceramic material and preparation method of silicon carbide porous ceramic material

Examples

  • Experimental program(2)

Example Embodiment

[0031] Example 1
[0032] Specific steps are as follows:
[0033] 1) Mix the raw materials according to the proportions shown in Table 1, first mechanically stir, and then ball mill to prepare a slurry; the silicon carbide powder adopts green silicon carbide;
[0034] 2) dipping and hanging the above-mentioned slurry on the template to obtain a preform; the template adopts an open polystyrene foam;
[0035] 3) Forming at low temperature according to the temperature shown in Table 1, and the heating time is 24h.
[0036] 4) Incubate at 160°C for 4h and fully solidify.
[0037] Table 1 Proportion and molding temperature of silicon carbide porous ceramic slurry
[0038]
[0039] testing method:
[0040] The measurement of open porosity is to first place the sample in water, and the change in the reading in the graduated cylinder is the sum of the volume of the sample and the volume of the closed mouth, and then seal the opening of the sample with silicone grease and place it in water. The change in the reading in the graduated cylinder is the total volume, that is, the sum of the sample volume, the closed volume and the open volume, the subtraction of the two is the open volume, and then divided by the total volume is the open porosity.
[0041] The flexural strength was measured using a three-point bending test.
[0042] Test Results:
[0043] Table 2 Water glass: test results of porosity and strength of samples with silicon carbide=10:3
[0044] molding temperature
[0045] Table 3 Water glass: test results of porosity and strength of samples with silicon carbide=10:5
[0046] molding temperature
[0047] Table 4 Water glass: test results of porosity and strength of samples with silicon carbide=10:7
[0048] molding temperature
[0049] Summarize:
[0050] When water glass: silicon carbide=10:3, the open porosity has a positive relationship with temperature, but when water glass: silicon carbide=10:5/10:7, there is no positive or negative relationship with temperature. This is because the curing effect is weaker and the foaming effect is stronger when the silicon carbide content is low. When the silicon carbide content is high, the curing effect is enhanced, so the porosity does not show a positive or negative relationship with temperature.
[0051] When water glass: silicon carbide = 10:5 to 10:7, the content of silicon carbide has little effect on the strength. However, the temperature causes the porosity to be different, resulting in a lower strength at 100°C than at 40 to 70°C when water glass:silicon carbide = 10:3 to 10:5.

Example Embodiment

[0052] Example 2
[0053] The difference between this example and Example 1 is that water is added on the basis of Example 1.
[0054] Specific steps are as follows:
[0055] 1) Mix the raw materials according to the proportioning in Table 5, first mechanically stir, and then ball mill to prepare slurry; the silicon carbide powder adopts black silicon carbide;
[0056] 2) dipping and hanging the above-mentioned slurry on the template to obtain a preform; the template adopts an open polyurethane foam;
[0057] 3) Forming at low temperature according to the temperature shown in Table 5, and the heating time is 36h.
[0058] 4) Incubate at 160°C for 4h to cure completely.
[0059] Table 5 The ratio and molding temperature of silicon carbide porous ceramic slurry
[0060]
[0061] Test Results:
[0062] Table 6 Test results of water glass: silicon carbide: water = 10: 3: 1 sample porosity and strength
[0063] molding temperature
[0064] Table 7 Test results of water glass: silicon carbide: water = 10: 3: 3 sample porosity and strength
[0065] molding temperature
[0066] Table 8 Test results of water glass: silicon carbide: water = 10:5:1 sample porosity and strength
[0067] molding temperature
[0068]Table 9 Water glass: silicon carbide: water = 10:5:3 sample porosity and strength test results
[0069] molding temperature
[0070] Table 10 Test results of water glass: silicon carbide: water = 10: 7: 2 sample porosity and strength
[0071] molding temperature
[0072] Table 11 Test results of water glass: silicon carbide: water = 10:7:4 sample porosity and strength
[0073] molding temperature
[0074] Summarize:
[0075] When the weight ratio is water glass: silicon carbide = 10:3, the open porosity basically shows a positive relationship with temperature, while when water glass: silicon carbide = 10:5/10:7, there is no positive relationship with temperature. Negative relationship or this relationship is not obvious. This is because the curing effect is weaker and the foaming effect is stronger when the silicon carbide content is low. When the silicon carbide content is high, the curing effect is enhanced, so the porosity does not show a positive or negative relationship with temperature.
[0076] When heated at 40°C, since the water does not reach the boiling point, it acts to dilute the water glass, but reduces the porosity. When heated at 70°C or 100°C, at or near the boiling point, the open porosity is similar to or even greater than that without water.
[0077] It is also found that the porosity is generally higher at 100 °C. The strength is generally 0.5-5MPa lower than that at 40°C and 70°C.
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Description & Claims & Application Information

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