Polysilazane composition, coated substrate, and multilayer construction

A polysilazane composition comprising

• an organopolysilazane compound comprising repeating units of the general formula (1):
• wherein R1 and R2 are each independently a substituted or unsubstituted C1-C20 monovalent hydrocarbon group which may contain a heteroatom, p is an integer of 0, 1, 2 or 3, a and b are numbers in the range:
• 0<a 1, 0 b<1, and a+b=1, the organopolysilazane compound having a number average molecular weight of 500 to 100,000 as measured by gel permeation chromatography versus polystyrene standards, and
• an organoxysilane compound having the general formula (2):
• R3m(OR4)3-mSi—R5—SiR6n(OR7)3-n (2)
• wherein R3, R4, R6 and R7 are each independently a substituted or unsubstituted C1-C20 monovalent hydrocarbon group which may contain a heteroatom, R5 is a substituted or unsubstituted C1-C30 divalent hydrocarbon group which may contain a heteroatom, and m and n are each independently an integer of 0, 1 or 2.