Which statement about ceramic selection for AM processes is true?

Ceramics in additive manufacturing often require a finishing process to achieve their full mechanical properties and strength. The nature of ceramic materials means that they typically undergo a sintering phase, which enhances density and strength after being printed. While some ceramics can be engineered to have good properties directly out of the printer, many applications necessitate additional processing to remove any residual porosity and to achieve the desired final characteristics, which may include improved thermal, electrical, or mechanical performance. This finishing could involve processes like polishing, glazing, or second-stage sintering.

In contrast, ceramics are typically not flexible or easy to mold like some other materials, and they often require careful handling due to their brittle nature. The assertion that ceramics can be printed without finishing overlooks the reality that most ceramic applications benefit significantly from post-processing. Additionally, claiming that ceramics have no limitations in additive manufacturing ignores the various constraints related to their brittleness, sintering behavior, and the technology used to print them. Thus, option C accurately reflects the common requirement for finishing in ceramic AM processes.