Platen for sintering soft ferrite in nitrogen kiln

Abstract

The invention relates to improvement on a sinter-bearing platen for sintering soft ferrite in a nitrogen kiln. The sinter-bearing platen is characterized by comprising 30 to 70 weight percent of sintered mullite granules of a grain size of less than or equal to 30 millimeters, 2 to 4.5 weight percent of quartz glass granules of a grain size of less than or equal to 0.5 millimeters, 10 to 35 weight percent of sintered alundum granules of a grain size of less than or equal to 3 millimeters , 5 to 20 weight percent of aluminum oxide micro powder of a grain size of less than or equal to 320 meshes, 3 to 10 weight percent of zirconium dioxide micro powder of a grain size of less than or equal to 320 meshes, 3 to 10 weight percent of silicon micro powder of a grain size of less than or equal to 320 meshes and 0.5 weight percent of aluminum trifluoride. Compared with the prior art, the comprehensive performance of the platen is improved substantially, the prepared products have high stability, the cycle times of the platen on the trial of the soft ferrite sintering nitrogen kiln exceeds 120 stably, and the pollution of the products is reduced simultaneously.

Description

technical field [0001] The invention is an improvement on the platen used for sintering nitrogen kiln with soft ferrite, in particular relates to a platen for sintered nitrogen kiln with soft ferrite with long effective service life (for example ≥ 120 times). Background technique [0002] Soft magnetic ferrite is the basic functional material of the electronics industry, and its sintering has special requirements. It is used in a 30-36m push-type nitrogen kiln at 1340-1400°C. The plate is the key component (also known as the push plate) that carries the product to push and run. It not only needs to meet the high temperature and atmosphere conditions of soft ferrite sintering, but also requires a thin platen (generally only about 30mm in thickness) to withstand 20-30kg / cm 2 Pressure, as well as the long-distance push extrusion force of the burned product, withstand the impact of high and low temperature changes caused by long-term cycles from room temperature → high temperatu...

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned prior art shows that although people continue to improve the material combination of the soft ferrite sintering platen in an attempt to increase its service life and pursue a long life, it is very difficult to break through the long life (such as stability ≥ 120 times). Large, due to the special sintering requirements and environment of soft ferrite, it is extremely difficult to find a long-life platen, and objectively, the strength and thermal shock resistance of refractory materials (resistance to sudden change in cold and heat) are themselves a pair. Contradictions, it is not easy to improve at the same time