Preparation method of electric heating ceramic die for precision spray forming
A ceramic mold and injection molding technology, which is applied in the field of preparation of electric heating ceramic molds for precision injection molding, can solve problems such as unsuitable control of bottom mold temperature, achieve accurate control, and improve the effect of density
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Embodiment 1
[0058] Preparation of Zircon Ceramic Template by Compressed Air Blowing Method
[0059] The main steps are as follows:
[0060] 1. Design and make a prototype template with a diameter of 200mm-400mm and a concave-convex surface;
[0061] 2. Turn over the silicone rubber template on the prototype template with concave-convex surface;
[0062] 3. Turn over the wax template on the silicone rubber mold;
[0063] 4. On the wax template, make a ceramic template with a thickness of 8mm-35mm and a concave-convex surface;
[0064] 5. Zircon ceramic template and electric heating wire furnace are assembled into electric heating ceramic mold.
[0065] The key to making precision injection molded electric heating ceramic molds is to prepare a ceramic template with a diameter of 400 mm, a thickness of 1 cm, and a fine concave-convex structure on the surface. The preparation process of the ceramic template is: prototype template with fine concave-convex structure on the surface→silicone ...
Embodiment 2
[0102] Fabrication of Electrically Heated Zircon Ceramic Templates by Direct Coating Method
[0103] The basic steps are as in Example 1. The zircon surface layer is first applied directly. First clean the wax template with absolute ethanol, and then hang the paint on the upper surface of the horizontally placed wax template after drying. The slurry will spread and cover the surface of the wax template under its own fluidity, and repair the uncovered parts with a brush place. The thickness of each layer is about 1-2mm, and the first layer can be slightly thinner. After each layer is coated with the slurry, it needs to be sanded. The zircon surface layer can be directly used as 200 mesh zircon powder for sanding, and the sanding should be uniform. The number of surface layers is 2 to 3 layers.
[0104] The volume density of the ceramic template prepared by direct coating method and sintered at 1350°C is 3.22g / cm 3 , the density is 75.6%, and the bending strength is 26.28MP...
Embodiment 3
[0106] Preparation of alumina ceramic template
[0107] The refractory powder used in the surface layer of alumina ceramic formwork is α-Al 2 o 3 Fused corundum, using silica sol as binder, adding surfactant and defoamer. The refractory powder for sanding is 200 mesh α-Al 2 o 3 pink.
[0108] The order of adding the alumina surface layer slurry is: silica sol→surfactant→α-Al 2 o 3 powder→defoamer. The detailed preparation process is as follows.
[0109] 1) Add the required silica sol;
[0110] 2) Start the mechanical stirrer to stir, and the rotating speed is 50 rpm;
[0111] 3) add sodium dodecylbenzene sulfonate according to the amount of surfactant that should be added per kilogram of silica sol;
[0112] 4) Slowly add the required α-Al according to the powder-to-liquid ratio 2 o 3 Powder, to avoid powder agglomeration;
[0113] 5) add n-octanol according to the amount of defoamer that should be added per kilogram of silica sol;
[0114] 6) After basically mix...
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