Tungsten Copper CTE

Tungsten Copper CTE
As a newer for tungsten copper seller, the manufacturing and machine is difficulty for my understanding. Today there is a client want to know whether tungsten copper for 90W10Cu coefficient of thermal expansion is changed by the temperature.
I need to ask lots of technicians to answer the question, and few know the answer. According to their reply, CTE for tungsten copper alloy owns low thermal expansion and changed little under different temperature.
Meanwhile I need to know more about tungsten copper alloy knowledge to answer different question.