Talking about the advantages and disadvantages of vacuum impregnation
The vacuum-pressure impregnation process has great advantages in terms of impregnation effect, uniformity, and work efficiency. The degree of vacuum required in the specific vacuum-pressure impregnation process, the vacuuming time and the applied pressure and pressurization time, the method of calcination and solidification in the post-treatment process, the temperature of the calcination and the final calcination temperature to obtain the workpiece The uniformity of the surface immersion liquid ion particles also has a great influence, and further process exploration is required for the specific material to be immersed in the workpiece and the immersion liquid.
Working principle of vacuum impregnation and sedimentation After mixing the impregnating solution and the workpiece, stirring or standing for a period of time, drying and roasting. The operation method is basically the same as the traditional wet impregnation. The workpiece is vacuumed first, then the impregnation liquid is added, and then a certain pressure is applied, and the impregnation liquid is quickly immersed into the gap of the workpiece by a differential pressure method. The desired immersion liquid, and an alkaline precipitant such as urea, ammonia water, sodium carbonate, and the workpiece are coprecipitated at a certain temperature, so that the immersion liquid ions are precipitated on the workpiece as a basic salt or a hydroxide.
The vacuum can remove the gas and water adsorbed inside the workpiece, which is beneficial to the impregnation liquid ions entering the inside of the surface of the workpiece. The surface of the workpiece is uniformly distributed and easily enters the inside of the tunnel by vacuum impregnation. The size and distribution of the impregnated particles on the workpiece are relatively uniform.
Disadvantages: When the amount of impregnation liquid is large, the uneven distribution of the impregnated material on the workpiece after immersion is more troublesome than the traditional wet impregnation operation. The addition time of the precipitant, the pH value of the precipitation, and the precipitation temperature have a great influence on the final result, and are not easy. control.
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