Rough surface/peeling

The product surface shows peeling, flaking, or rough unevenness. Surface defects directly affect the appearance quality and service performance of the product, and are particularly obvious in transparent products. This defect affects the appearance quality of the product and reduces the market competitiveness of the product.

(1) Temperature parameter aspect: Excessively high surface temperature during sintering causes the surface layer to melt and shrink first and separate from the core layer, which may cause thermal degradation of the material or loss of control of the reaction rate, destroying the internal structure of the product. (2) Mold aspect: The inner wall finish of the mold is insufficient; the mold structure or state directly affects the flow and molding of the material in the cavity. (3) Raw material characteristic aspect: The surface layer powder is damaged by bridging during preforming; the physical characteristics of the powder directly affect the preforming and sintering quality.

(1) Process control: Control the sintering heating rate to avoid the surface shrinking before the core, establish an online monitoring mechanism, set upper and lower parameter limits and implement alarm management. (2) Implementation measure: Improve the mold surface finish, formulate specific operation plans in combination with actual production conditions, and verify the implementation effect. (3) Material selection: Use a release agent or release film., establish material selection evaluation standards, and determine the optimal plan through comparative tests. (4) Preventive measure: Establish a sound process control standard and quality inspection system, and regularly review process data for continuous optimization.

Surface defects are the result of the combined effects of mold state, process parameters, and material formulation, and each factor needs to be systematically investigated and optimized in a targeted manner.