Excessive porosity of sintered products

Excessive interconnected or closed pores remain inside the product. Internal defects reduce the mechanical strength and compactness of the product, and have a particularly serious impact on products with pressure-bearing and sealing requirements.

(1) Pressure parameter aspect: Insufficient preforming pressure results in the powder particles not being closely packed, causing the material to fail to fully fill or to be insufficiently densified, and the product density and bonding strength decrease. (2) Raw material characteristic aspect: Insufficient sintering results in insufficient melt bonding between particles; the physical characteristics of the powder directly affect the preforming and sintering quality. (3) Process factor: The material itself has poor sinterability; this factor affects the '2079851475616104453 and final quality of the product.

(1) Parameter adjustment: Increase the preforming pressure until large particles break and pack densely; it needs to be evaluated in combination with equipment capacity, gradually increase the pressure and check the compactness and dimensional changes of the product. (2) Process optimization: Extend the sintering holding time, determine a reasonable time according to the product wall thickness and material characteristics, and balance production efficiency and quality. (3) Implementation measure: Secondary sintering for further densification., formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (4) Preventive measure: Establish a sound process control standard and quality inspection system, and regularly review process data for continuous optimization.

This problem needs to be comprehensively analyzed from multiple dimensions of material, process, equipment, and operation, and solved by systematically optimizing process parameters and the quality control system.