Internal voids/pores

Irregular holes can be seen in the product cross-section. This defect is usually found after demolding of the product or during cross-section inspection, and is mostly concentrated in thick-wall areas or at the end of resin flow. 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) Gas removal aspect: Air entrapped in the powder during preforming is not discharged; gas retention forms internal defects affecting the compactness of the product. (2) Mold aspect: The bridging effect of the blank (powder forming an arch structure in the mold cavity) leads to low local density; the mold structure or state directly affects the flow and molding of the material in the cavity. (3) Process factor: Volatiles escape during sintering; this factor affects the '2079851475616104453 and final quality of the product.

(1) Parameter adjustment: Increase the preforming pressure and maintain sufficient holding time to discharge air; 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) Formulation adjustment: Optimize the powder particle morphology to improve flowability and reduce bridging, adjust gradually and verify the effect to ensure that other performance indicators of the product are not affected. (3) Process control: Control the moisture content of the raw material., establish an online monitoring mechanism, set upper and lower parameter limits and implement alarm management. (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.