Dry-pressing preparation method of magnesium oxide ceramics
A technology of magnesia and ceramics, which is applied in the field of metallurgy, can solve the problems of tedious operation and high production cost of magnesia ceramics, and achieve the effect of reducing production links, good compactness and high density
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[0017] The invention provides a method for preparing magnesium oxide ceramics by dry pressing, comprising the following steps:
[0018] a. Magnesium oxide powder is subjected to magnetic separation through an electromagnetic magnetic separator, and ball milled into 350-400 mesh powder after magnetic separation; the magnetic field strength is 0.5-2T during the magnetic separation;
[0019] b. Use the airflow granulation method to granulate the magnesium oxide powder; when granulating, control the vacuum degree of the granulator to 0.1-0.3pa, and the air flow rate to be 3-5L / min;
[0020] c. The granulated magnesium oxide particles are pressed into a semi-finished product with a powder press machine; the pressing temperature is 20-60°C, the pressing pressure is 0.1-2Mpa, and the pressing time is 10-30min;
[0021] d. Put the semi-finished product obtained in step c into a sintering furnace for sintering, and obtain magnesium oxide ceramics after sintering; the sintering temperat...
Embodiment 1
[0027] Example 1 Preparation of magnesia ceramics by the method of the present invention
[0028] The specific operation steps are as follows:
[0029] a, magnesium oxide powder is carried out magnetic separation through electromagnetic magnetic separator, after magnetic separation, ball milling becomes 350 mesh powder; Magnetic field intensity is 0.5T during described magnetic separation;
[0030] b. Use the airflow granulation method to granulate the magnesium oxide powder; when granulating, control the vacuum degree of the granulator to 0.1pa, and the air flow rate to be 3L / min;
[0031] c. The granulated magnesium oxide particles are pressed into a semi-finished product using a powder compactor; the pressing temperature is 20°C, the pressing pressure is 0.1Mpa, and the pressing time is 10min;
[0032] d. Put the semi-finished product obtained in step c into a sintering furnace for sintering, and obtain magnesium oxide ceramic 1 after sintering; the sintering temperature i...
Embodiment 2
[0033] Example 2 Preparation of magnesia ceramics by the method of the present invention
[0034] The specific operation steps are as follows:
[0035] a, magnesium oxide powder is carried out magnetic separation through electromagnetic magnetic separator, and after magnetic separation, ball mills into 400 mesh powder; Magnetic field strength is 2T during described magnetic separation;
[0036] B. Use the airflow granulation method to granulate the magnesium oxide powder; when granulating, control the vacuum degree of the granulator to 0.3pa, and the air flow rate is 5L / min;
[0037] c. The granulated magnesium oxide particles are pressed into a semi-finished product using a powder compactor; the pressing temperature is 60°C, the pressing pressure is 2Mpa, and the pressing time is 30min;
[0038] d. Put the semi-finished product obtained in step c into a sintering furnace for sintering, and obtain magnesium oxide ceramic 2 after sintering; the sintering temperature is 1300° C...
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