Pressure Contour Diagram

Purpose: Learn to calculate pressure contour diagram. In this example, the pressure contour lines of total pressure and partial pressure of N2 in the Ti-N system will be calculated and plotted on the Ti-N binary phase diagram.

Module: PanPhaseDiagram

Thermodynamic Database: TiN_Gas_Pressure.tdb

Batch file: Example_#1.16.pbfx

Calculation Procedures:

• Load TiN_Gas_Pressure.tdb following the procedure in Pandat User's Guide: Load Database , and select both Ti, Ni components;

• First set up the calculation condition as shown in Figure 1 for calculating Ti-N binary phase diagram, then click “Contour Lines” to open the contour line dialog as shown in Figure 2;

  

  Figure 1:  Setup calculation for Ti-N binary phase diagram, then click "Contour Lines"

• Choose “User Custom Type” and click AddType in “log(P(@gas))” for the Contour Type in the “Properties” window as shown in Figure 2, then press OK;

Post Calculation Operation:

• Change graph appearance following the procedure in Pandat User's Guide: Property;

• Label each line by putting the cursor on each line and wait for the tool tip to pop out, then press F2;

Information obtained from this calculation:

• Figure 3 shows the contour diagram of total pressure in Ti-N system;

• If we type in “log(P(N2@gas))” as the Contour Type in the “Properties” window in Figure 2, we will obtained the contour diagram for partial pressure logP(N2) as shown in Figure 4;