Microwave sintering method and auxiliary heating device for alumina ceramic balls
A technology of alumina ceramics and microwave sintering, applied in the field of ceramic molding products, can solve the problems of poor uniformity of sintered products, cumbersome sintering process, large energy consumption, etc., and achieve the effects of short sintering time, convenient operation and energy saving
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Embodiment 1
[0035] The microwave sintering method of alumina ceramic balls in this embodiment is prepared by the following steps:
[0036] 1)Al 2 o 3 The mass content of the powder is 99%, and the balance is SiO 2 、TiO 2 , MgO and CaO mixture, SiO in the mixture 2、TiO 2 The mass ratio of , MgO and CaO is 1:1:1:1. Will Al 2 o 3 Powder and SiO 2 、TiO 2 , MgO and CaO mixtures are mixed and ball milled to make a mixture, which is formed into a solid alumina ceramic ball green body by isostatic pressing. The structure of the alumina ceramic ball green body is as follows figure 1 As shown, the ball diameter is 80mm. Put the obtained green body and the auxiliary heating material into the microwave sintering cavity;
[0037] 2) Turn on the microwave source, adjust the microwave input power, preheat at a rate of 3°C / min in the low temperature stage, and the preheating time is 100min to ensure that the green body is evenly heated;
[0038] 3) Continuously adjust the microwave input powe...
Embodiment 2～5
[0043] Examples 2-5 The microwave sintering method of alumina ceramic balls, the sintering process is basically the same as that of Example 1, and the process parameters and the performance of alumina ceramic balls are listed in Table 1:
[0044] The microwave sintering process parameters of table 1 embodiment 2~5 alumina ceramic balls
[0045]
[0046] (Note 1: The total sintering time is the total time from turning on the microwave source to turning off the microwave source.)
Embodiment 6
[0048] The microwave sintering method of alumina ceramic balls in this embodiment is prepared by the following steps:
[0049] 1)Al 2 o 3 The mass content of the powder is 99%, and the balance is SiO 2 、TiO 2 , MgO and CaO mixture, SiO in the mixture 2 、TiO 2 The mass ratio of , MgO and CaO is 1:1:1:1. Will Al 2 o 3 Powder and SiO 2 、TiO 2 , MgO and CaO mixtures are mixed and ball milled to make a mixture, which is made into a solid alumina ceramic ball green body by isostatic pressing. Put the obtained green body and the auxiliary heating material into the microwave sintering cavity;
[0050] 2) Turn on the microwave source, continuously adjust the microwave input power, raise the temperature at a rate of 5°C / min, monitor the reflected power until the reflected power is stable (the fluctuation range of the current is below 10μA);
[0051] 3) Raise the temperature to a sintering temperature of 1550°C at a rate of 3°C / min, and keep it warm for 40 minutes, so that the...
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Abstract
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