Rare earth tantalate ceramic resisting corrosion of low melting point oxide and preparation method therefor

A method for preparing a rare earth tantalate ceramic resisting corrosion of a low melting point oxide, wherein a general chemical formula of the ceramic is RETaO4, a crystal structure of the ceramic has a monoclinic phase, a lattice space group of the ceramic is l2(5), and a density of the ceramic is greater than 98%;

• wherein the method comprising:
• operation (1):
• weighing RE2O3 powder and Ta2O5 powder with a molar ratio of RE:Ta of 1:1 and adding to a solvent to mix, and ball milling the mixed solution with a ball mill to obtain powder A;
• operation (2):
• drying the powder A obtained in operation (1), and sieving the powder A for a first time to obtain powder B;
• operation (3):
• placing the powder B obtained in operation (2) in a mold for compaction, holding a pressure, and pre-sintering the powder B to form a block C, wherein a holding pressure ranges from 200 to 300 MPa, a holding-pressure time ranges from 1 to 10 min, a pre-sintering temperature ranges from 800 to 1200° C., and a pre-sintering time ranges from 10 to 20 h;
• operation (4):
• cooling the block C in operation (3) to room temperature, grounding the block C with a grinder, and sieving the block C for a second time to obtain powder D;
• and
• operation (5):
• sintering the powder D in operation (4) to obtain the rare earth tantalate ceramic resisting corrosion of the low melting point oxide, wherein a sintering temperature ranges from 1500 to 1800° C., and a pressure sintering time ranges from 5 to 30 min.