morphology desired on the final silicone nitride prod› uct. 

15. The method of claim 14 wherein, in the produc› tion of high purity silicone nitride, the transaminating reaction is run at a temperature of 100’ -200" C. in the presence of a strongly acid catalyst. 

16. The method of claim 15 wherein the strongly acidic catalyst is H2S04. 

17. The method of claim 14 wherein, in the produc› tion of silazane polymers to be used as impregnants in porous preformed ceramic parts, the transaminating reaction is run at a temperature of 20’ -80’ C. in the presence of a mildly acidic catalyst. 

18. The method of claim 17 wherein the mildly acidic catalyst is para-toluene sulfonic acid. 

19. The method of claim 1 wherein the transaminat› ing reaction is run in a solvent which is largely unreac› tive under the reaction conditions. 

20. The method of claim 19 wherein said solvent is selected from the group consisting of alkanes and alkyl› ated benzenes having 6-20 carbon atoms wherein the reaction products are insoluble. 

21. The method of claim 19 wherein the solvent is 25 selected from the group consisting of alkanes and alkyl› ated benzenes having 6-10 carbon atoms wherein the reaction products are soluble. 

22. The method of claim 19 wherein the solvent is toluene or xylene. 

23. The method of claim 1 wherein the starting aminosilane reactant comprises a mixture of polymers as defmed by the aminosilane general formula tran› saminated with amine. 

24. The method of claim aminosilane reactants are 23 wherein the starting mixtures of tris(dime- 

thylamino)silane and vinyltris(dimethyamino) silane transaminated with NH3 

25. The method of claim 23 wherein the starting aminosilane reactants are mixtures of tris(dime- thylamino)silane and vinyl-tris(dimethylamino)silane transmitted with CH3 NH2 

26. The silazane polymers produced by the method of claim 1. 

27. The silazane polymers produced by the method of claim 1 wherein c= 1 or 2. 

28. The silazane polymers produced by the method of claim 14. 

29. The silazane polymers produced by the method of claim 1 wherein the starting reactant comprises a mix- ture of polymers as defined by the aminosilane general formula transaminated with amine. 

30. The silazane polymers produced by the method of claim 1 wherein the starting aminosilane reactants are mixtures of tris(dimethylamino)silane and vinyl-tri(- dimethylamino)silane transaminated with NH3. 

31. The silazane polymers produced by the method of claim 1 wherein the starting aminosilane reactants are mixtures of tris-(dimethylamino)silane and vinyl-tris(› dimethylamino)silane transaminated with CH3NH2. 

32. The silicon nitride-containing ceramics prepared from the silazane polymers of claim 26. 

33. The silicon nitride-containing ceramics prepared from the silazane polymers of claim 27. 

34. The silicone nitride-containing ceramics prepared from the silazane polymers of claim 28. 

35. The silicon nitride-containing ceramics prepared from the silazane polymers of claim 29. 

36. The silicon nitride-containing ceramics prepared from the silazane polymers of claim 30. 

37. The silicon nitride-containing ceramics prepared from the silazane polymers of claim 31. 

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