The effect of solid compounds promoting heterogeneous nucleation can be interpreted as an electrostatic effect between substrates and nucleated phases,with heterogeneous nucleation being considered as caused by the free energy change due to the redistribution of free electrons at the interface of substrate and nucleated phase.

The results showed that Ti and Zr was compatible,grain structures of weld were coarse columnar grains with a little Ti or Zr in filler wires,Al3Ti and Al3Zr were formed in the welding pool with additions of a little Ti and Zr in filler wires,which provided the heterogeneous nucleation sites for α(Al).

There were much titanium precipitates in the bottom and side surface of crucible whereas less in inside and surface layer of hot metal by SEM analysis of experimental iron samples,which show that titanium compounds were precipitated by heterogeneous nucleation crystals and that graphitic refractory were more in favor of heterogeneous nucleation than other materials.

Ferrite MgFe2O4 coated carbonyl iron composite powder was prepared by heterogeneous nucleation combined with the liquid deposition method to improve the oxidation resistance performance of carbonyl iron powder.

Al_2O_3 nanosized composite powders encapsulated by ZrO_2(3Y) were prepared by heterogeneous nucleation combined with the co-deposition and were molded by dry pressing.

ZrO_2(3Y)encapsulated Al_2O_3 nano composite powders were prepared by heterogeneous nucleation combined with the liquid co-deposition method using pH buffer solution as precipitator.

The precursors of hydrate ferric oxide and basic nickel carbonate coated graphite microspheres were synthesized by the aqueous heterogeneous nucleation process using ferrous (Ⅱ) sulfate, nickel sulfate, sodium carbonate and graphite microspheres as main raw materials.

The precursor microspheres of Fe_2O_3·nH_2O coated with graphite were synthesized by the aqueous heterogeneous nucleation using ferrous(Ⅱ)sulfate,sodium carbonate and graphite microspheres as main raw materials.

Some features of the movement of internal particles within the concrete accompanied with settlement, segregation,and bleeding are analysed and investigated in this paper,and some methods for reducing the concrete shrinkage such as stipulating the concrete curing conditions,employing the skeleton effect of coarse aggregate,and creating nonhomogeneous phase coring are also investigated.

The calculation according to the theory of planar lattice disregistry shows that as the heterogeneous nuclei of primary austenite in medium high carbon steel during surfacing, the Ce 2O 3, La 2O 3 and Ce 2O 2S are effective, and the SiO 2.

The calculation according to the theory of planar latticedisregistry shows that a mong the inclusions ,the Ce2 O3is the most effective , while Ce2 O2 Sis medium effec tive and Ce Sis the m ostineffective as the heterogeneous nuclei of primary austenite in Fe C alloys .

The experimental results indicate that BN is the heterogeneous nuclei of graphite stimulate formation of graphite,which in tested sample,and the graphitization of medium carbon is realized.