In this paper, the effects of heat-treatment conditions,
including nucleation temperature/time and crystallization
temperature/time, on the crystal type, microstructure,
and thermal expansion behavior of LZAS glass–ceramics
using P2O5 as nucleation agent will be investigated systematically.
One of the main aims is to explore thermal treatment
conditions of the glass–ceramics with suitable TEC
in Li2O–ZnO–Al2O3–SiO2–P2O5 system for meeting the
sealing requirement to 4J29 alloys and 10# steel, expecting
to obtain the glass–ceramics with different TECs by adopting
different heat-treatment conditions to an identical
composition basic glass. The TEC of 4J29 alloys is about
47–52 · 107 C1, but the TEC of 10# steel is about
120–130 · 107 C1. This requests that the crystallites
with higher or lower TEC than one of the basic glass can
be precipitated when the glass is treated under different
heat-treatment conditions. Only some composition glasses
in Li2O–ZnO–Al2O3–SiO2–P2O5 system can meet the
requirement