Study On Mechanical Properties Of 3D Printing Pure Titanium Base Materials

Objective:The denture made o f pure titanium base material has the excellent c haracteristics of light weight,comfortable wearing,hard to damage,safe and non-toxic.Because of this,it has been unanimously recognized by doctors and patients in the clinical repair process.There are genera lly three processing technologies for pure titanium base materials:casting process,cutting process and 3D printing process.In this paper,the mechanical properties,processing efficiency and qualification rate of pure titanium specimens made by the above three processing technologies are studied to understand the advantages and disadvantages o f different processing methods,so as to provide reference for the selection of processing technology of pure titanium base materials in clinical.In the process of embedding casting,the traditional casting process is easily affected by external factors,and it is easy to produce manufacturing defects such as micropores,cracks,sand holes,etc.the process is complicated and the processing efficiency is slow.The cutting process is a material reduction process that the whole raw material is cut and formed.The part of the raw material that is cut down usually cannot be recycled,resulting in the waste of the raw material.3D printing process is a kind of additive process that can print and stack metal powder layer by layer.Compared with traditional casting process,this manufacturing method can reduce manufacturing defects,improve the utilization rate of raw materials,compared with cutting process.Moreover,3D printing technology can also process more complex spatial structure and higher processing accuracy.Its process flow is quite different from other processes.It can print multiple test pieces at the same time,and the processing efficiency is significantly improved.It is because 3D printing has many advantages that 3D printing has a better development potential in the future clinical application.The processing procedures of different processing and manufacturing methods are different,and the micro morphology and crystal phase performance are also different.Finally,the mechanical properties of the workpiece are also different.Therefore,it is very necessary to test the mechanical properties of the three different processing methods(casting,cutting,3D printing).It is necessary to understand the advantages of 3D printing technology,and objectively understand the shortcomings of 3D printing technology,so as to provide direction for the optimization and development of 3D printing technology.Method:1.Preparation of test piece: se lect raw materials with titanium content of more than 99%,process them in three different ways:casting,cutting and 3D printing,and make test pieces with the same size of sheet mold mechanical properties,which are divided into casting group,cutting group and 3D printing group,with six tensile test pieces in each group.2.Imaging inspection: conduct imaging inspection on the success fully manufactured test pieces,and screen out the test pieces with obvious manufacturing defects.3.Mechanical property test:at room temperature,three groups of specimens(casting group,cutting group,3D printing group)were pulled on universal tensile testing machine,and the tensile strength,elongation and elastic modulus of each specimen were counted.4.Calculation of processing time and qualified rate:Statistics of processing time and qualified rate of three groups of time.5.Statistical analysis.Conclusion:1.The average tensile strength of 3D printing group was 628.11 MPa,that of cutting group was 885.04 MPa,and that of casting group was 378.12 MPa.Through statistical analysis,the tensile strength of 3D printing group was better than that of casting group(P < 0.05),but weaker than that of cutting group(P < 0.05).2.The average elongation of 3D printing group was 31.1%,that of cutting group was 16.5%,and that of casting group was 11.9%.By statistical analysis,the elongation of 3D printing group was better than that of casting group and cutting group(P < 0.05).3.The average elastic modulus of 3D printing group was 101.34 MPa,that of cutting group was 108.16 MPa,and that of casting group was 102.54 MPa.Through statistical analysis,the elastic modulus of 3D printing group was lower than that of cutting group(P < 0.05),and there was no significant difference between 3D printing group and casting group(P > 0.05).4.The total processing time of 3D printing single piece is 3h,the total processing time of cutting single piece is 7h,the processing time of casting single piece is 23 h,the processing time of 3D printing is the shortest,the processing efficiency is higher,the qualification rate of 3D printing group and cutting group is 100%,while the qualification rate of casting group is 60%,and the qualification rate of 3D printing and cutting technology is higher than that of casting tec hnology.