A kind of high-emissivity glass glaze and method for preparing high-emissivity coating from the glaze
A glaze and coating technology, which is applied in the field of functional composite materials, can solve the problems of poor matching of linear expansion coefficient and insufficient temperature resistance of rigid heat insulation tile base
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Embodiment 1
[0049] Embodiment 1 prepares high emissivity glass frit
[0050]Pass the following raw materials through a 300-mesh sieve: fused silica powder, extra-hard glass powder, boron carbide powder, molybdenum disilicide powder and clay powder. Then weigh two portions of sieved raw materials according to the following dosages: each portion includes 140 grams of fused silica powder, 40 grams of extra-hard glass powder, 20 grams of boron carbide powder, 10 grams of molybdenum disilicide powder, and 10 grams of clay powder. Put the above two parts of powder into two ball milling tanks with a volume of 2 liters respectively, add 660 grams of deionized water and 4.0 grams of polyacrylate ammonium salt solution with a concentration of 20% by mass and a pH value of 7 into the ball milling tanks, Each ball mill jar is filled with zirconia balls with a cumulative volume of 700 milliliters. Put the ball mill jar on a horizontal industrial ball mill, adjust the rotating speed to 500 rpm, and mi...
Embodiment 19
[0055] Embodiment 19 prepares high emissivity coating
[0056] Use compressed air to blow off the dust on the surface of the rigid heat insulation tile substrate, and then put it in a muffle furnace at 600°C for 30 minutes to completely remove the oil stains remaining on the surface of the heat insulation tile during processing and handling. Repair small defects on the surface of the heat insulation tile base. Then use adhesive tape to protect the side breathing area and the bottom surface (the area not to be coated) of the rigid insulation tile, and place it on the spraying tool to prepare for spraying. Adjust the pressure of compressed air to 4MPa for spraying. According to 0.06g / cm 2 The amount of slurry used in Example 1 was sprayed on the surface and side of the heat insulation tile. Put the sprayed thermal insulation tile in the air to dry for at least 2 hours, then put it in an oven at 80°C for 2 hours, then transfer it to an oven at 120°C and bake it to constant wei...
Embodiment 20
[0057] Embodiment 20 The influence of ammonium polyacrylate ceramic dispersant on glaze dispersion effect
[0058] The basic formula and process are exactly the same as in Example 1, but the above-mentioned ammonium polyacrylate ceramic dispersant is not added. Take a small amount of the glass frit obtained from Example 1 and the above formula without adding the above-mentioned ammonium polyacrylate ceramic dispersant, respectively, and put them into two settling tubes to stand still, and observe the settling process. It was found that the glass powder of the above-mentioned glaze composition without the above-mentioned ammonium polyacrylate ceramic dispersant was placed for 20 minutes, and the glass powder had obviously settled, while the glass powder of the glaze composition of Example 1 was still not observed after being placed for 1 month. Obvious subsidence. It can be seen that the addition of ammonium polyacrylate ceramic dispersant improves the suspension characteristi...
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